Ausführliche Erläuterung der Kapselung gängiger JavaScript-Toolklassen

因为工作中经常用到这些方法，所有便把这些方法进行了总结。本文主要给大家详细分析了javascript常用工具类的封装相关知识点，有兴趣的朋友参考下吧，希望能帮助到大家。

JavaScript 1. type 类型判断

isString (o) { //是否字符串
  return Object.prototype.toString.call(o).slice(8, -1) === 'String'
}
isNumber (o) { //是否数字
  return Object.prototype.toString.call(o).slice(8, -1) === 'Number'
}
isObj (o) { //是否对象
  return Object.prototype.toString.call(o).slice(8, -1) === 'Object'
}
isArray (o) { //是否数组
  return Object.prototype.toString.call(o).slice(8, -1) === 'Array'
}
isDate (o) { //是否时间
  return Object.prototype.toString.call(o).slice(8, -1) === 'Date'
}
isBoolean (o) { //是否boolean
  return Object.prototype.toString.call(o).slice(8, -1) === 'Boolean'
}
isFunction (o) { //是否函数
  return Object.prototype.toString.call(o).slice(8, -1) === 'Function'
}
isNull (o) { //是否为null
  return Object.prototype.toString.call(o).slice(8, -1) === 'Null'
}
isUndefined (o) { //是否undefined
  return Object.prototype.toString.call(o).slice(8, -1) === 'Undefined'
}
isFalse (o) {
  if (o == '' || o == undefined || o == null || o == 'null' || o == 'undefined' || o == 0 || o == false || o == NaN) return true
  return false
}
isTrue (o) {
  return !this.isFalse(o)
}
isIos () {
  var u = navigator.userAgent;
  if (u.indexOf('Android') > -1 || u.indexOf('Linux') > -1) {//安卓手机
    // return "Android";
    return false
  } else if (u.indexOf('iPhone') > -1) {//苹果手机
    // return "iPhone";
    return true
  } else if (u.indexOf('iPad') > -1) {//iPad
    // return "iPad";
    return false
  } else if (u.indexOf('Windows Phone') > -1) {//winphone手机
    // return "Windows Phone";
    return false
  }else{
    return false
  }
}
isPC () { //是否为PC端
  var userAgentInfo = navigator.userAgent;
  var Agents = ["Android", "iPhone",
        "SymbianOS", "Windows Phone",
        "iPad", "iPod"];
  var flag = true;
  for (var v = 0; v < Agents.length; v++) {
    if (userAgentInfo.indexOf(Agents[v]) > 0) {
      flag = false;
      break;
    }
  }
  return flag;
}
browserType(){
  var userAgent = navigator.userAgent; //取得浏览器的userAgent字符串
  var isOpera = userAgent.indexOf("Opera") > -1; //判断是否Opera浏览器
  var isIE = userAgent.indexOf("compatible") > -1 && userAgent.indexOf("MSIE") > -1 && !isOpera; //判断是否IE浏览器
  var isEdge = userAgent.indexOf("Edge") > -1; //判断是否IE的Edge浏览器
  var isFF = userAgent.indexOf("Firefox") > -1; //判断是否Firefox浏览器
  var isSafari = userAgent.indexOf("Safari") > -1 && userAgent.indexOf("Chrome") == -1; //判断是否Safari浏览器
  var isChrome = userAgent.indexOf("Chrome") > -1 && userAgent.indexOf("Safari") > -1; //判断Chrome浏览器
  if (isIE) {
    var reIE = new RegExp("MSIE (\\d+\\.\\d+);");
    reIE.test(userAgent);
    var fIEVersion = parseFloat(RegExp["$1"]);
    if(fIEVersion == 7) return "IE7"
    else if(fIEVersion == 8) return "IE8";
    else if(fIEVersion == 9) return "IE9";
    else if(fIEVersion == 10) return "IE10";
    else if(fIEVersion == 11) return "IE11";
    else return "IE7以下"//IE版本过低
  }

  if (isFF) return "FF";
  if (isOpera) return "Opera";
  if (isEdge) return "Edge";
  if (isSafari) return "Safari";
  if (isChrome) return "Chrome";
}
checkStr (str, type) {
  switch (type) {
    case &#39;phone&#39;:  //手机号码
      return /^1[3|4|5|7|8][0-9]{9}$/.test(str);
    case &#39;tel&#39;:   //座机
      return /^(0\d{2,3}-\d{7,8})(-\d{1,4})?$/.test(str);
    case &#39;card&#39;:  //身份证
      return /^\d{15}|\d{18}$/.test(str);
    case &#39;pwd&#39;:   //密码以字母开头，长度在6~18之间，只能包含字母、数字和下划线
      return /^[a-zA-Z]\w{5,17}$/.test(str)
    case &#39;postal&#39;: //邮政编码
      return /[1-9]\d{5}(?!\d)/.test(str);
    case &#39;QQ&#39;:   //QQ号
      return /^[1-9][0-9]{4,9}$/.test(str);
    case &#39;email&#39;:  //邮箱
      return /^[\w-]+(\.[\w-]+)*@[\w-]+(\.[\w-]+)+$/.test(str);
    case &#39;money&#39;:  //金额(小数点2位)
      return /^\d*(?:\.\d{0,2})?$/.test(str);
    case &#39;URL&#39;:   //网址
      return /(http|ftp|https):\/\/[\w\-_]+(\.[\w\-_]+)+([\w\-\.,@?^=%&:/~\+#]*[\w\-\@?^=%&/~\+#])?/.test(str)
    case &#39;IP&#39;:   //IP
      return /((?:(?:25[0-5]|2[0-4]\\d|[01]?\\d?\\d)\\.){3}(?:25[0-5]|2[0-4]\\d|[01]?\\d?\\d))/.test(str);
    case &#39;date&#39;:  //日期时间
      return /^(\d{4})\-(\d{2})\-(\d{2}) (\d{2})(?:\:\d{2}|:(\d{2}):(\d{2}))$/.test(str) || /^(\d{4})\-(\d{2})\-(\d{2})$/.test(str)
    case &#39;number&#39;: //数字
      return /^[0-9]$/.test(str);
    case &#39;english&#39;: //英文
      return /^[a-zA-Z]+$/.test(str);
    case &#39;chinese&#39;: //中文
      return /^[\u4E00-\u9FA5]+$/.test(str);
    case &#39;lower&#39;:  //小写
      return /^[a-z]+$/.test(str);
    case &#39;upper&#39;:  //大写
      return /^[A-Z]+$/.test(str);
    case &#39;HTML&#39;:  //HTML标记
      return /<("[^"]*"|&#39;[^&#39;]*&#39;|[^&#39;">])*>/.test(str);
    default:
      return true;
  }
}

2. Date

/**
 * 格式化时间
 * 
 * @param {time} 时间
 * @param {cFormat} 格式
 * @return {String} 字符串
 *
 * @example formatTime('2018-1-29', '{y}/{m}/{d} {h}:{i}:{s}') // -> 2018/01/29 00:00:00
 */
formatTime(time, cFormat) {
  if (arguments.length === 0) return null
  if ((time + '').length === 10) {
    time = +time * 1000
  }
  var format = cFormat || '{y}-{m}-{d} {h}:{i}:{s}', date
  if (typeof time === 'object') {
    date = time
  } else {
    date = new Date(time)
  }
  var formatObj = {
    y: date.getFullYear(),
    m: date.getMonth() + 1,
    d: date.getDate(),
    h: date.getHours(),
    i: date.getMinutes(),
    s: date.getSeconds(),
    a: date.getDay()
  }
  var time_str = format.replace(/{(y|m|d|h|i|s|a)+}/g, (result, key) => {
    var value = formatObj[key]
    if (key === 'a') return ['一', '二', '三', '四', '五', '六', '日'][value - 1]
    if (result.length > 0 && value < 10) {
      value = &#39;0&#39; + value
    }
    return value || 0
  })
  return time_str
}
/**
 * 返回指定长度的月份集合
 * 
 * @param {time} 时间
 * @param {len} 长度
 * @param {direction} 方向： 1: 前几个月; 2: 后几个月; 3:前后几个月 默认 3
 * @return {Array} 数组
 * 
 * @example  getMonths(&#39;2018-1-29&#39;, 6, 1) // -> ["2018-1", "2017-12", "2017-11", "2017-10", "2017-9", "2017-8", "2017-7"]
 */
getMonths(time, len, direction) {
  var mm = new Date(time).getMonth(),
    yy = new Date(time).getFullYear(),
    direction = isNaN(direction) ? 3 : direction,
    index = mm;
  var cutMonth = function(index) {
    if ( index <= len && index >= -len) {
      return direction === 1 ? formatPre(index).concat(cutMonth(++index)):
        direction === 2 ? formatNext(index).concat(cutMonth(++index)):formatCurr(index).concat(cutMonth(++index))
    }
    return []
  }
  var formatNext = function(i) {
    var y = Math.floor(i/12),
      m = i%12
    return [yy+y + &#39;-&#39; + (m+1)]
  }
  var formatPre = function(i) {
    var y = Math.ceil(i/12),
      m = i%12
    m = m===0 ? 12 : m
    return [yy-y + &#39;-&#39; + (13 - m)]
  }
  var formatCurr = function(i) {
    var y = Math.floor(i/12),
      yNext = Math.ceil(i/12),
      m = i%12,
      mNext = m===0 ? 12 : m
    return [yy-yNext + &#39;-&#39; + (13 - mNext),yy+y + &#39;-&#39; + (m+1)]
  }
  // 数组去重
  var unique = function(arr) {
    if ( Array.hasOwnProperty(&#39;from&#39;) ) {
      return Array.from(new Set(arr));
    }else{
      var n = {},r=[]; 
      for(var i = 0; i < arr.length; i++){
        if (!n[arr[i]]){
          n[arr[i]] = true; 
          r.push(arr[i]);
        }
      }
      return r;
    }
  }
  return direction !== 3 ? cutMonth(index) : unique(cutMonth(index).sort(function(t1, t2){
    return new Date(t1).getTime() - new Date(t2).getTime()
  }))
}
/**
 * 返回指定长度的天数集合
 * 
 * @param {time} 时间
 * @param {len} 长度
 * @param {direction} 方向： 1: 前几天; 2: 后几天; 3:前后几天 默认 3
 * @return {Array} 数组
 *
 * @example date.getDays(&#39;2018-1-29&#39;, 6) // -> ["2018-1-26", "2018-1-27", "2018-1-28", "2018-1-29", "2018-1-30", "2018-1-31", "2018-2-1"]
 */
getDays(time, len, diretion) {
  var tt = new Date(time)
  var getDay = function(day) {
    var t = new Date(time)
    t.setDate(t.getDate() + day)
    var m = t.getMonth()+1
    return t.getFullYear()+&#39;-&#39;+m+&#39;-&#39;+t.getDate()
  }
  var arr = []
  if (diretion === 1) {
    for (var i = 1; i <= len; i++) {
      arr.unshift(getDay(-i))
    }
  }else if(diretion === 2) {
    for (var i = 1; i <= len; i++) {
      arr.push(getDay(i))
    }
  }else {
    for (var i = 1; i <= len; i++) {
      arr.unshift(getDay(-i))
    }
    arr.push(tt.getFullYear()+&#39;-&#39;+(tt.getMonth()+1)+&#39;-&#39;+tt.getDate())
    for (var i = 1; i <= len; i++) {
      arr.push(getDay(i))
    }
  }
  return diretion === 1 ? arr.concat([tt.getFullYear()+&#39;-&#39;+(tt.getMonth()+1)+&#39;-&#39;+tt.getDate()]) : 
    diretion === 2 ? [tt.getFullYear()+&#39;-&#39;+(tt.getMonth()+1)+&#39;-&#39;+tt.getDate()].concat(arr) : arr
}
/**
 * @param {s} 秒数
 * @return {String} 字符串 
 *
 * @example formatHMS(3610) // -> 1h0m10s
 */
formatHMS (s) {
  var str = &#39;&#39;
  if (s > 3600) {
    str = Math.floor(s/3600)+&#39;h&#39;+Math.floor(s%3600/60)+&#39;m&#39;+s%60+&#39;s&#39;
  }else if(s > 60) {
    str = Math.floor(s/60)+&#39;m&#39;+s%60+&#39;s&#39;
  }else{
    str = s%60+&#39;s&#39;
  }
  return str
}
/*获取某月有多少天*/
getMonthOfDay (time) {
  var date = new Date(time)
  var year = date.getFullYear()
  var mouth = date.getMonth() + 1
  var days

  //当月份为二月时，根据闰年还是非闰年判断天数
  if (mouth == 2) {
    days = year % 4 == 0 ? 29 : 28
  } else if (mouth == 1 || mouth == 3 || mouth == 5 || mouth == 7 || mouth == 8 || mouth == 10 || mouth == 12) {
    //月份为：1,3,5,7,8,10,12 时，为大月.则天数为31；
    days = 31
  } else {
    //其他月份，天数为：30.
    days = 30
  }
  return days
}
/*获取某年有多少天*/
getYearOfDay (time) {
  var firstDayYear = this.getFirstDayOfYear(time);
  var lastDayYear = this.getLastDayOfYear(time);
  var numSecond = (new Date(lastDayYear).getTime() - new Date(firstDayYear).getTime())/1000;
  return Math.ceil(numSecond/(24*3600));
}
/*获取某年的第一天*/
getFirstDayOfYear (time) {
  var year = new Date(time).getFullYear();
  return year + "-01-01 00:00:00";
}
/*获取某年最后一天*/
getLastDayOfYear (time) {
  var year = new Date(time).getFullYear();
  var dateString = year + "-12-01 00:00:00";
  var endDay = this.getMonthOfDay(dateString);
  return year + "-12-" + endDay + " 23:59:59";
}
/*获取某个日期是当年中的第几天*/
getDayOfYear (time) {
  var firstDayYear = this.getFirstDayOfYear(time);
  var numSecond = (new Date(time).getTime() - new Date(firstDayYear).getTime())/1000;
  return Math.ceil(numSecond/(24*3600));
}
/*获取某个日期在这一年的第几周*/
getDayOfYearWeek (time) {
  var numdays = this.getDayOfYear(time);
  return Math.ceil(numdays / 7);
}

3. Array

/*判断一个元素是否在数组中*/
contains (arr, val) {
  return arr.indexOf(val) != -1 ? true : false;
}
/**
 * @param {arr} 数组
 * @param {fn} 回调函数
 * @return {undefined}
 */
each (arr, fn) {
  fn = fn || Function;
  var a = [];
  var args = Array.prototype.slice.call(arguments, 1);
  for(var i = 0; i < arr.length; i++) {
    var res = fn.apply(arr, [arr[i], i].concat(args));
    if(res != null) a.push(res);
  }
}
/**
 * @param {arr} 数组
 * @param {fn} 回调函数
 * @param {thisObj} this指向
 * @return {Array} 
 */
map (arr, fn, thisObj) {
  var scope = thisObj || window;
  var a = [];
  for(var i = 0, j = arr.length; i < j; ++i) {
    var res = fn.call(scope, arr[i], i, this);
    if(res != null) a.push(res);
  }
  return a;
}
/**
 * @param {arr} 数组
 * @param {type} 1：从小到大  2：从大到小  3：随机
 * @return {Array}
 */
sort (arr, type = 1) {
  return arr.sort( (a, b) => {
    switch(type) {
      case 1:
        return a - b;
      case 2:
        return b - a;
      case 3:
        return Math.random() - 0.5;
      default:
        return arr;
    }
  })
}

/*去重*/
unique (arr) {
  if ( Array.hasOwnProperty(&#39;from&#39;) ) {
    return Array.from(new Set(arr));
  }else{
    var n = {},r=[]; 
    for(var i = 0; i < arr.length; i++){
      if (!n[arr[i]]){
        n[arr[i]] = true; 
        r.push(arr[i]);
      }
    }
    return r;
  }
}

/*求两个集合的并集*/
union (a, b) {
  var newArr = a.concat(b);
  return this.unique(newArr);
}

/*求两个集合的交集*/
intersect (a, b) {
  var _this = this;
  a = this.unique(a);
  return this.map(a, function(o) {
    return _this.contains(b, o) ? o : null;
  });
}

/*删除其中一个元素*/
remove (arr, ele) {
  var index = arr.indexOf(ele);
  if(index > -1) {
    arr.splice(index, 1);
  }
  return arr;
}

/*将类数组转换为数组的方法*/
formArray (ary) {
  var arr = [];
  if(Array.isArray(ary)) {
    arr = ary;
  } else {
    arr = Array.prototype.slice.call(ary);
  };
  return arr;
}

/*最大值*/
max (arr) {
  return Math.max.apply(null, arr);
}

/*最小值*/
min (arr) {
  return Math.min.apply(null, arr);
}

/*求和*/
sum (arr) {
  return arr.reduce( (pre, cur) => {
    return pre + cur
  })
}

/*平均值*/
average (arr) {
  return this.sum(arr)/arr.length
}

4. String 字符串操作

/**
 * 去除空格
 * @param {str}
 * @param {type} 
 *    type: 1-所有空格 2-前后空格 3-前空格 4-后空格
 * @return {String}
 */
trim (str, type) {
  type = type || 1
  switch (type) {
    case 1:
      return str.replace(/\s+/g, "");
    case 2:
      return str.replace(/(^\s*)|(\s*$)/g, "");
    case 3:
      return str.replace(/(^\s*)/g, "");
    case 4:
      return str.replace(/(\s*$)/g, "");
    default:
      return str;
  }
}

/**
 * @param {str} 
 * @param {type}
 *    type: 1:首字母大写 2：首页母小写 3：大小写转换 4：全部大写 5：全部小写
 * @return {String}
 */
changeCase (str, type) {
  type = type || 4
  switch (type) {
    case 1:
      return str.replace(/\b\w+\b/g, function (word) {
        return word.substring(0, 1).toUpperCase() + word.substring(1).toLowerCase();

      });
    case 2:
      return str.replace(/\b\w+\b/g, function (word) {
        return word.substring(0, 1).toLowerCase() + word.substring(1).toUpperCase();
      });
    case 3:
      return str.split('').map( function(word){
        if (/[a-z]/.test(word)) {
          return word.toUpperCase();
        }else{
          return word.toLowerCase()
        }
      }).join('')
    case 4:
      return str.toUpperCase();
    case 5:
      return str.toLowerCase();
    default:
      return str;
  }
}


/*
  检测密码强度
*/
checkPwd (str) {
  var Lv = 0;
  if (str.length < 6) {
    return Lv
  }
  if (/[0-9]/.test(str)) {
    Lv++
  }
  if (/[a-z]/.test(str)) {
    Lv++
  }
  if (/[A-Z]/.test(str)) {
    Lv++
  }
  if (/[\.|-|_]/.test(str)) {
    Lv++
  }
  return Lv;
}

/*过滤html代码(把<>转换)*/
filterTag (str) {
  str = str.replace(/&/ig, "&");
  str = str.replace(/</ig, "<");
  str = str.replace(/>/ig, ">");
  str = str.replace(" ", " ");
  return str;
}

5. Number

/*随机数范围*/
random (min, max) {
  if (arguments.length === 2) {
    return Math.floor(min + Math.random() * ( (max+1) - min ))
  }else{
    return null;
  }
  
}

/*将阿拉伯数字翻译成中文的大写数字*/
numberToChinese (num) {
  var AA = new Array("零", "一", "二", "三", "四", "五", "六", "七", "八", "九", "十");
  var BB = new Array("", "十", "百", "仟", "萬", "億", "点", "");
  var a = ("" + num).replace(/(^0*)/g, "").split("."),
    k = 0,
    re = "";
  for(var i = a[0].length - 1; i >= 0; i--) {
    switch(k) {
      case 0:
        re = BB[7] + re;
        break;
      case 4:
        if(!new RegExp("0{4}//d{" + (a[0].length - i - 1) + "}$")
          .test(a[0]))
          re = BB[4] + re;
        break;
      case 8:
        re = BB[5] + re;
        BB[7] = BB[5];
        k = 0;
        break;
    }
    if(k % 4 == 2 && a[0].charAt(i + 2) != 0 && a[0].charAt(i + 1) == 0)
      re = AA[0] + re;
    if(a[0].charAt(i) != 0)
      re = AA[a[0].charAt(i)] + BB[k % 4] + re;
    k++;
  }

  if(a.length > 1) // 加上小数部分(如果有小数部分)
  {
    re += BB[6];
    for(var i = 0; i < a[1].length; i++)
      re += AA[a[1].charAt(i)];
  }
  if(re == &#39;一十&#39;)
    re = "十";
  if(re.match(/^一/) && re.length == 3)
    re = re.replace("一", "");
  return re;
}

/*将数字转换为大写金额*/
changeToChinese (Num) {
    //判断如果传递进来的不是字符的话转换为字符
    if(typeof Num == "number") {
      Num = new String(Num);
    };
    Num = Num.replace(/,/g, "") //替换tomoney()中的“,”
    Num = Num.replace(/ /g, "") //替换tomoney()中的空格
    Num = Num.replace(/￥/g, "") //替换掉可能出现的￥字符
    if(isNaN(Num)) { //验证输入的字符是否为数字
      //alert("请检查小写金额是否正确");
      return "";
    };
    //字符处理完毕后开始转换，采用前后两部分分别转换
    var part = String(Num).split(".");
    var newchar = "";
    //小数点前进行转化
    for(var i = part[0].length - 1; i >= 0; i--) {
      if(part[0].length > 10) {
        return "";
        //若数量超过拾亿单位，提示
      }
      var tmpnewchar = ""
      var perchar = part[0].charAt(i);
      switch(perchar) {
        case "0":
          tmpnewchar = "零" + tmpnewchar;
          break;
        case "1":
          tmpnewchar = "壹" + tmpnewchar;
          break;
        case "2":
          tmpnewchar = "贰" + tmpnewchar;
          break;
        case "3":
          tmpnewchar = "叁" + tmpnewchar;
          break;
        case "4":
          tmpnewchar = "肆" + tmpnewchar;
          break;
        case "5":
          tmpnewchar = "伍" + tmpnewchar;
          break;
        case "6":
          tmpnewchar = "陆" + tmpnewchar;
          break;
        case "7":
          tmpnewchar = "柒" + tmpnewchar;
          break;
        case "8":
          tmpnewchar = "捌" + tmpnewchar;
          break;
        case "9":
          tmpnewchar = "玖" + tmpnewchar;
          break;
      }
      switch(part[0].length - i - 1) {
        case 0:
          tmpnewchar = tmpnewchar + "元";
          break;
        case 1:
          if(perchar != 0) tmpnewchar = tmpnewchar + "拾";
          break;
        case 2:
          if(perchar != 0) tmpnewchar = tmpnewchar + "佰";
          break;
        case 3:
          if(perchar != 0) tmpnewchar = tmpnewchar + "仟";
          break;
        case 4:
          tmpnewchar = tmpnewchar + "万";
          break;
        case 5:
          if(perchar != 0) tmpnewchar = tmpnewchar + "拾";
          break;
        case 6:
          if(perchar != 0) tmpnewchar = tmpnewchar + "佰";
          break;
        case 7:
          if(perchar != 0) tmpnewchar = tmpnewchar + "仟";
          break;
        case 8:
          tmpnewchar = tmpnewchar + "亿";
          break;
        case 9:
          tmpnewchar = tmpnewchar + "拾";
          break;
      }
      var newchar = tmpnewchar + newchar;
    }
    //小数点之后进行转化
    if(Num.indexOf(".") != -1) {
      if(part[1].length > 2) {
        // alert("小数点之后只能保留两位,系统将自动截断");
        part[1] = part[1].substr(0, 2)
      }
      for(i = 0; i < part[1].length; i++) {
        tmpnewchar = ""
        perchar = part[1].charAt(i)
        switch(perchar) {
          case "0":
            tmpnewchar = "零" + tmpnewchar;
            break;
          case "1":
            tmpnewchar = "壹" + tmpnewchar;
            break;
          case "2":
            tmpnewchar = "贰" + tmpnewchar;
            break;
          case "3":
            tmpnewchar = "叁" + tmpnewchar;
            break;
          case "4":
            tmpnewchar = "肆" + tmpnewchar;
            break;
          case "5":
            tmpnewchar = "伍" + tmpnewchar;
            break;
          case "6":
            tmpnewchar = "陆" + tmpnewchar;
            break;
          case "7":
            tmpnewchar = "柒" + tmpnewchar;
            break;
          case "8":
            tmpnewchar = "捌" + tmpnewchar;
            break;
          case "9":
            tmpnewchar = "玖" + tmpnewchar;
            break;
        }
        if(i == 0) tmpnewchar = tmpnewchar + "角";
        if(i == 1) tmpnewchar = tmpnewchar + "分";
        newchar = newchar + tmpnewchar;
      }
    }
    //替换所有无用汉字
    while(newchar.search("零零") != -1)
      newchar = newchar.replace("零零", "零");
    newchar = newchar.replace("零亿", "亿");
    newchar = newchar.replace("亿万", "亿");
    newchar = newchar.replace("零万", "万");
    newchar = newchar.replace("零元", "元");
    newchar = newchar.replace("零角", "");
    newchar = newchar.replace("零分", "");
    if(newchar.charAt(newchar.length - 1) == "元") {
      newchar = newchar + "整"
    }
    return newchar;
  }

6. Http

/**
 * @param {setting}
 */
ajax(setting){
  //设置参数的初始值
  var opts={
    method: (setting.method || "GET").toUpperCase(), //请求方式
    url: setting.url || "", // 请求地址
    async: setting.async || true, // 是否异步
    dataType: setting.dataType || "json", // 解析方式
    data: setting.data || "", // 参数
    success: setting.success || function(){}, // 请求成功回调
    error: setting.error || function(){} // 请求失败回调
  }

  // 参数格式化
  function params_format (obj) {
    var str = ''
    for (var i in obj) {
      str += i + '=' + obj[i] + '&'
    }
    return str.split('').slice(0, -1).join('')
  }

  // 创建ajax对象
  var xhr=new XMLHttpRequest();

  // 连接服务器open(方法GET/POST，请求地址， 异步传输)
  if(opts.method == 'GET'){
    xhr.open(opts.method, opts.url + "?" + params_format(opts.data), opts.async);
    xhr.send();
  }else{
    xhr.open(opts.method, opts.url, opts.async);
    xhr.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
    xhr.send(opts.data);
  }
  
  /*
  ** 每当readyState改变时，就会触发onreadystatechange事件
  ** readyState属性存储有XMLHttpRequest的状态信息
  ** 0 ：请求未初始化
  ** 1 ：服务器连接已建立
  ** 2 ：请求已接受
  ** 3 : 请求处理中
  ** 4 ：请求已完成，且相应就绪
  */
  xhr.onreadystatechange = function() {
    if (xhr.readyState === 4 && (xhr.status === 200 || xhr.status === 304)) {
      switch(opts.dataType){
        case "json":
          var json = JSON.parse(xhr.responseText);
          opts.success(json);
          break;
        case "xml":
          opts.success(xhr.responseXML);
          break;
        default:
          opts.success(xhr.responseText);
          break;
      }
    }
  }

  xhr.onerror = function(err) {
    opts.error(err);
  }
}

/**
 * @param {url}
 * @param {setting}
 * @return {Promise}
 */
fetch(url, setting) {
  //设置参数的初始值
  let opts={
    method: (setting.method || 'GET').toUpperCase(), //请求方式
    headers : setting.headers || {}, // 请求头设置
    credentials : setting.credentials || true, // 设置cookie是否一起发送
    body: setting.body || {},
    mode : setting.mode || 'no-cors', // 可以设置 cors, no-cors, same-origin
    redirect : setting.redirect || 'follow', // follow, error, manual
    cache : setting.cache || 'default' // 设置 cache 模式 (default, reload, no-cache)
  }
  let dataType = setting.dataType || "json", // 解析方式 
    data = setting.data || "" // 参数

  // 参数格式化
  function params_format (obj) {
    var str = ''
    for (var i in obj) {
      str += `${i}=${obj[i]}&`
    }
    return str.split('').slice(0, -1).join('')
  }

  if (opts.method === 'GET') {
    url = url + (data?`?${params_format(data)}`:'')
  }else{
    setting.body = data || {}
  }

  return new Promise( (resolve, reject) => {
    fetch(url, opts).then( async res => {
      let data = dataType === 'text' ? await res.text() :
        dataType === 'blob' ? await res.blob() : await res.json() 
      resolve(data)
    }).catch( e => {
      reject(e)
    })
  })
  
}

7. DOM

$ (selector){ 
  var type = selector.substring(0, 1);
  if (type === '#') {
    if (document.querySelecotor) return document.querySelector(selector)
      return document.getElementById(selector.substring(1))
    
  }else if (type === '.') {
    if (document.querySelecotorAll) return document.querySelectorAll(selector)
      return document.getElementsByClassName(selector.substring(1))
  }else{
    return document['querySelectorAll' ? 'querySelectorAll':'getElementsByTagName'](selector)
  }
} 

/*检测类名*/
hasClass (ele, name) {
  return ele.className.match(new RegExp('(\\s|^)' + name + '(\\s|$)'));
}

/*添加类名*/
addClass (ele, name) {
  if (!this.hasClass(ele, name)) ele.className += " " + name;
}

/*删除类名*/
removeClass (ele, name) {
  if (this.hasClass(ele, name)) {
    var reg = new RegExp('(\\s|^)' + name + '(\\s|$)');
    ele.className = ele.className.replace(reg, '');
  }
}

/*替换类名*/
replaceClass (ele, newName, oldName) {
  this.removeClass(ele, oldName);
  this.addClass(ele, newName);
}

/*获取兄弟节点*/
siblings (ele) {
  console.log(ele.parentNode)
  var chid = ele.parentNode.children,eleMatch = []; 
  for(var i = 0, len = chid.length; i < len; i ++){ 
    if(chid[i] != ele){ 
      eleMatch.push(chid[i]); 
    } 
  } 
  return eleMatch;
}

/*获取行间样式属性*/
getByStyle (obj,name){
  if(obj.currentStyle){
    return obj.currentStyle[name];
  }else{
    return getComputedStyle(obj,false)[name];
  }
}

8. Storage 储存操作

class StorageFn {
  constructor () {
    this.ls = window.localStorage;
    this.ss = window.sessionStorage;
  }

  /*-----------------cookie---------------------*/
  /*设置cookie*/
  setCookie (name, value, day) {
    var setting = arguments[0];
    if (Object.prototype.toString.call(setting).slice(8, -1) === 'Object'){
      for (var i in setting) {
        var oDate = new Date();
        oDate.setDate(oDate.getDate() + day);
        document.cookie = i + '=' + setting[i] + ';expires=' + oDate;
      }
    }else{
      var oDate = new Date();
      oDate.setDate(oDate.getDate() + day);
      document.cookie = name + '=' + value + ';expires=' + oDate;
    }
    
  }

  /*获取cookie*/
  getCookie (name) {
    var arr = document.cookie.split('; ');
    for (var i = 0; i < arr.length; i++) {
      var arr2 = arr[i].split(&#39;=&#39;);
      if (arr2[0] == name) {
        return arr2[1];
      }
    }
    return &#39;&#39;;
  }

  /*删除cookie*/
  removeCookie (name) {
    this.setCookie(name, 1, -1);
  }


  /*-----------------localStorage---------------------*/
  /*设置localStorage*/
  setLocal(key, val) {
    var setting = arguments[0];
    if (Object.prototype.toString.call(setting).slice(8, -1) === &#39;Object&#39;){
      for(var i in setting){
        this.ls.setItem(i, JSON.stringify(setting[i]))
      }
    }else{
      this.ls.setItem(key, JSON.stringify(val))
    }
    
  }

  /*获取localStorage*/
  getLocal(key) {
    if (key) return JSON.parse(this.ls.getItem(key))
    return null;
    
  }

  /*移除localStorage*/
  removeLocal(key) {
    this.ls.removeItem(key)
  }

  /*移除所有localStorage*/
  clearLocal() {
    this.ls.clear()
  }


  /*-----------------sessionStorage---------------------*/
  /*设置sessionStorage*/
  setSession(key, val) {
    var setting = arguments[0];
    if (Object.prototype.toString.call(setting).slice(8, -1) === &#39;Object&#39;){
      for(var i in setting){
        this.ss.setItem(i, JSON.stringify(setting[i]))
      }
    }else{
      this.ss.setItem(key, JSON.stringify(val))
    }
    
  }

  /*获取sessionStorage*/
  getSession(key) {
    if (key) return JSON.parse(this.ss.getItem(key))
    return null;
    
  }

  /*移除sessionStorage*/
  removeSession(key) {
    this.ss.removeItem(key)
  }

  /*移除所有sessionStorage*/
  clearSession() {
    this.ss.clear()
  }

  
}

9. Other 其它操作

/*获取网址参数*/
getURL(name){
  var reg = new RegExp("(^|&)"+ name +"=([^&]*)(&|$)");
  var r = window.location.search.substr(1).match(reg);
  if(r!=null) return r[2]; return null;
}

/*获取全部url参数,并转换成json对象*/
getUrlAllParams (url) {
  var url = url ? url : window.location.href;
  var _pa = url.substring(url.indexOf('?') + 1),
    _arrS = _pa.split('&'),
    _rs = {};
  for (var i = 0, _len = _arrS.length; i < _len; i++) {
    var pos = _arrS[i].indexOf(&#39;=&#39;);
    if (pos == -1) {
      continue;
    }
    var name = _arrS[i].substring(0, pos),
      value = window.decodeURIComponent(_arrS[i].substring(pos + 1));
    _rs[name] = value;
  }
  return _rs;
}

/*删除url指定参数，返回url*/
delParamsUrl(url, name){
  var baseUrl = url.split(&#39;?&#39;)[0] + &#39;?&#39;;
  var query = url.split(&#39;?&#39;)[1];
  if (query.indexOf(name)>-1) {
    var obj = {}
    var arr = query.split("&");
    for (var i = 0; i < arr.length; i++) {
      arr[i] = arr[i].split("=");
      obj[arr[i][0]] = arr[i][1];
    };
    delete obj[name];
    var url = baseUrl + JSON.stringify(obj).replace(/[\"\{\}]/g,"").replace(/\:/g,"=").replace(/\,/g,"&");
    return url
  }else{
    return url;
  }
}

/*获取十六进制随机颜色*/
getRandomColor () {
  return &#39;#&#39; + (function(h) {
    return new Array(7 - h.length).join("0") + h;
  })((Math.random() * 0x1000000 << 0).toString(16));
}

/*图片加载*/
imgLoadAll(arr,callback){
  var arrImg = []; 
  for (var i = 0; i < arr.length; i++) {
    var img = new Image();
    img.src = arr[i];
    img.onload = function(){
      arrImg.push(this);
      if (arrImg.length == arr.length) {
        callback && callback();
      }
    }
  }
}

/*音频加载*/
loadAudio(src, callback) {
  var audio = new Audio(src);
  audio.onloadedmetadata = callback;
  audio.src = src;
}

/*DOM转字符串*/
domToStirng(htmlDOM){
  var p= document.createElement("p");
  p.appendChild(htmlDOM);
  return p.innerHTML
}

/*字符串转DOM*/
stringToDom(htmlString){
  var p= document.createElement("p");
  p.innerHTML=htmlString;
  return p.children[0];
}


/**
 * 光标所在位置插入字符，并设置光标位置
 * 
 * @param {dom} 输入框
 * @param {val} 插入的值
 * @param {posLen} 光标位置处在 插入的值的哪个位置
 */
setCursorPosition (dom,val,posLen) {
  var cursorPosition = 0;
  if(dom.selectionStart){
    cursorPosition = dom.selectionStart;
  }
  this.insertAtCursor(dom,val);
  dom.focus();
  console.log(posLen)
  dom.setSelectionRange(dom.value.length,cursorPosition + (posLen || val.length));
}

/*光标所在位置插入字符*/
insertAtCursor(dom, val) {
  if (document.selection){
    dom.focus();
    sel = document.selection.createRange();
    sel.text = val;
    sel.select();
  }else if (dom.selectionStart || dom.selectionStart == &#39;0&#39;){
    let startPos = dom.selectionStart;
    let endPos = dom.selectionEnd;
    let restoreTop = dom.scrollTop;
    dom.value = dom.value.substring(0, startPos) + val + dom.value.substring(endPos, dom.value.length);
    if (restoreTop > 0){
      dom.scrollTop = restoreTop;
    }
    dom.focus();
    dom.selectionStart = startPos + val.length;
    dom.selectionEnd = startPos + val.length;
  } else {
    dom.value += val;
    dom.focus();
  }
}

CSS 1. pc-reset PC样式初始化

/* normalize.css */

html {
 line-height: 1.15;
 /* 1 */
 -ms-text-size-adjust: 100%;
 /* 2 */
 -webkit-text-size-adjust: 100%;
 /* 2 */
}

body {
 margin: 0;
}

article,
aside,
footer,
header,
nav,
section {
 display: block;
}

h1 {
 font-size: 2em;
 margin: 0.67em 0;
}

figcaption,
figure,
main {
 /* 1 */
 display: block;
}

figure {
 margin: 1em 40px;
}

hr {
 box-sizing: content-box;
 /* 1 */
 height: 0;
 /* 1 */
 overflow: visible;
 /* 2 */
}

pre {
 font-family: monospace, monospace;
 /* 1 */
 font-size: 1em;
 /* 2 */
}

a {
 background-color: transparent;
 /* 1 */
 -webkit-text-decoration-skip: objects;
 /* 2 */
}

abbr[title] {
 border-bottom: none;
 /* 1 */
 text-decoration: underline;
 /* 2 */
 text-decoration: underline dotted;
 /* 2 */
}

b,
strong {
 font-weight: inherit;
}

b,
strong {
 font-weight: bolder;
}

code,
kbd,
samp {
 font-family: monospace, monospace;
 /* 1 */
 font-size: 1em;
 /* 2 */
}

dfn {
 font-style: italic;
}

mark {
 background-color: #ff0;
 color: #000;
}

small {
 font-size: 80%;
}

sub,
sup {
 font-size: 75%;
 line-height: 0;
 position: relative;
 vertical-align: baseline;
}

sub {
 bottom: -0.25em;
}

sup {
 top: -0.5em;
}

audio,
video {
 display: inline-block;
}

audio:not([controls]) {
 display: none;
 height: 0;
}

img {
 border-style: none;
}

svg:not(:root) {
 overflow: hidden;
}

button,
input,
optgroup,
select,
textarea {
 font-family: sans-serif;
 /* 1 */
 font-size: 100%;
 /* 1 */
 line-height: 1.15;
 /* 1 */
 margin: 0;
 /* 2 */
}

button,
input {
 /* 1 */
 overflow: visible;
}

button,
select {
 /* 1 */
 text-transform: none;
}

button,
html [type="button"],

/* 1 */

[type="reset"],
[type="submit"] {
 -webkit-appearance: button;
 /* 2 */
}

button::-moz-focus-inner,
[type="button"]::-moz-focus-inner,
[type="reset"]::-moz-focus-inner,
[type="submit"]::-moz-focus-inner {
 border-style: none;
 padding: 0;
}

button:-moz-focusring,
[type="button"]:-moz-focusring,
[type="reset"]:-moz-focusring,
[type="submit"]:-moz-focusring {
 outline: 1px dotted ButtonText;
}

fieldset {
 padding: 0.35em 0.75em 0.625em;
}

legend {
 box-sizing: border-box;
 /* 1 */
 color: inherit;
 /* 2 */
 display: table;
 /* 1 */
 max-width: 100%;
 /* 1 */
 padding: 0;
 /* 3 */
 white-space: normal;
 /* 1 */
}

progress {
 display: inline-block;
 /* 1 */
 vertical-align: baseline;
 /* 2 */
}

textarea {
 overflow: auto;
}

[type="checkbox"],
[type="radio"] {
 box-sizing: border-box;
 /* 1 */
 padding: 0;
 /* 2 */
}

[type="number"]::-webkit-inner-spin-button,
[type="number"]::-webkit-outer-spin-button {
 height: auto;
}

[type="search"] {
 -webkit-appearance: textfield;
 /* 1 */
 outline-offset: -2px;
 /* 2 */
}

[type="search"]::-webkit-search-cancel-button,
[type="search"]::-webkit-search-decoration {
 -webkit-appearance: none;
}

 ::-webkit-file-upload-button {
 -webkit-appearance: button;
 /* 1 */
 font: inherit;
 /* 2 */
}

details,

/* 1 */

menu {
 display: block;
}

summary {
 display: list-item;
}

canvas {
 display: inline-block;
}

template {
 display: none;
}

[hidden] {
 display: none;
}


/* reset */

html,
body,
h1,
h2,
h3,
h4,
h5,
h6,
p,
dl,
dt,
dd,
ul,
ol,
li,
p,
blockquote,
pre,
hr,
figure,
table,
caption,
th,
td,
form,
fieldset,
legend,
input,
button,
textarea,
menu {
 margin: 0;
 padding: 0;
 box-sizing: border-box;
}

2. Phone-reset

/* normalize.css */

html {
 line-height: 1.15;
 /* 1 */
 -ms-text-size-adjust: 100%;
 /* 2 */
 -webkit-text-size-adjust: 100%;
 /* 2 */
}

body {
 margin: 0;
}

article,
aside,
footer,
header,
nav,
section {
 display: block;
}

h1 {
 font-size: 2em;
 margin: 0.67em 0;
}

figcaption,
figure,
main {
 /* 1 */
 display: block;
}

figure {
 margin: 1em 40px;
}

hr {
 box-sizing: content-box;
 /* 1 */
 height: 0;
 /* 1 */
 overflow: visible;
 /* 2 */
}

pre {
 font-family: monospace, monospace;
 /* 1 */
 font-size: 1em;
 /* 2 */
}

a {
 background-color: transparent;
 /* 1 */
 -webkit-text-decoration-skip: objects;
 /* 2 */
}

abbr[title] {
 border-bottom: none;
 /* 1 */
 text-decoration: underline;
 /* 2 */
 text-decoration: underline dotted;
 /* 2 */
}

b,
strong {
 font-weight: inherit;
}

b,
strong {
 font-weight: bolder;
}

code,
kbd,
samp {
 font-family: monospace, monospace;
 /* 1 */
 font-size: 1em;
 /* 2 */
}

dfn {
 font-style: italic;
}

mark {
 background-color: #ff0;
 color: #000;
}

small {
 font-size: 80%;
}

sub,
sup {
 font-size: 75%;
 line-height: 0;
 position: relative;
 vertical-align: baseline;
}

sub {
 bottom: -0.25em;
}

sup {
 top: -0.5em;
}

audio,
video {
 display: inline-block;
}

audio:not([controls]) {
 display: none;
 height: 0;
}

img {
 border-style: none;
}

svg:not(:root) {
 overflow: hidden;
}

button,
input,
optgroup,
select,
textarea {
 font-family: sans-serif;
 /* 1 */
 font-size: 100%;
 /* 1 */
 line-height: 1.15;
 /* 1 */
 margin: 0;
 /* 2 */
}

button,
input {
 /* 1 */
 overflow: visible;
}

button,
select {
 /* 1 */
 text-transform: none;
}

button,
html [type="button"],

/* 1 */

[type="reset"],
[type="submit"] {
 -webkit-appearance: button;
 /* 2 */
}

button::-moz-focus-inner,
[type="button"]::-moz-focus-inner,
[type="reset"]::-moz-focus-inner,
[type="submit"]::-moz-focus-inner {
 border-style: none;
 padding: 0;
}

button:-moz-focusring,
[type="button"]:-moz-focusring,
[type="reset"]:-moz-focusring,
[type="submit"]:-moz-focusring {
 outline: 1px dotted ButtonText;
}

fieldset {
 padding: 0.35em 0.75em 0.625em;
}

legend {
 box-sizing: border-box;
 /* 1 */
 color: inherit;
 /* 2 */
 display: table;
 /* 1 */
 max-width: 100%;
 /* 1 */
 padding: 0;
 /* 3 */
 white-space: normal;
 /* 1 */
}

progress {
 display: inline-block;
 /* 1 */
 vertical-align: baseline;
 /* 2 */
}

textarea {
 overflow: auto;
}

[type="checkbox"],
[type="radio"] {
 box-sizing: border-box;
 /* 1 */
 padding: 0;
 /* 2 */
}

[type="number"]::-webkit-inner-spin-button,
[type="number"]::-webkit-outer-spin-button {
 height: auto;
}

[type="search"] {
 -webkit-appearance: textfield;
 /* 1 */
 outline-offset: -2px;
 /* 2 */
}

[type="search"]::-webkit-search-cancel-button,
[type="search"]::-webkit-search-decoration {
 -webkit-appearance: none;
}

 ::-webkit-file-upload-button {
 -webkit-appearance: button;
 /* 1 */
 font: inherit;
 /* 2 */
}

details,

/* 1 */

menu {
 display: block;
}

summary {
 display: list-item;
}

canvas {
 display: inline-block;
}

template {
 display: none;
}

[hidden] {
 display: none;
}


/* reset */

html,
body,
h1,
h2,
h3,
h4,
h5,
h6,
p,
dl,
dt,
dd,
ul,
ol,
li,
p,
blockquote,
pre,
hr,
figure,
table,
caption,
th,
td,
form,
fieldset,
legend,
input,
button,
textarea,
menu {
 margin: 0;
 padding: 0;
 box-sizing: border-box;
}

html,
body {
 /* 禁止选中文本 */
 -webkit-user-select: none;
 user-select: none;
 font: Oswald, 'Open Sans', Helvetica, Arial, sans-serif
}


/* 禁止长按链接与图片弹出菜单 */

a,
img {
 -webkit-touch-callout: none;
}


/*ios android去除自带阴影的样式*/

a,
input {
 -webkit-tap-highlight-color: rgba(0, 0, 0, 0);
}

input[type="text"] {
 -webkit-appearance: none;
}

3. 公共样式提取

/* 禁止选中文本 */
.usn{
  -webkit-user-select:none;
  -moz-user-select:none;
  -ms-user-select:none;
  -o-user-select:none;
  user-select:none;
}
/* 浮动 */
.fl { float: left; }
.fr { float: right; }
.cf { zoom: 1; }
.cf:after {
  content:".";
  display:block;
  clear:both;
  visibility:hidden;
  height:0;
  overflow:hidden;
}

/* 元素类型 */
.db { display: block; }
.dn { display: none; }
.di { display: inline }
.dib {display: inline-block;}
.transparent { opacity: 0 }


/*文字排版、颜色*/
.f12 { font-size:12px }
.f14 { font-size:14px }
.f16 { font-size:16px }
.f18 { font-size:18px }
.f20 { font-size:20px }
.fb { font-weight:bold }
.fn { font-weight:normal }
.t2 { text-indent:2em }
.red,a.red { color:#cc0031 }
.darkblue,a.darkblue { color:#039 }
.gray,a.gray { color:#878787 }
.lh150 { line-height:150% }
.lh180 { line-height:180% }
.lh200 { line-height:200% }
.unl { text-decoration:underline; }
.no_unl { text-decoration:none; }
.tl { text-align: left; }
.tc { text-align: center; }
.tr { text-align: right; }
.tj { text-align: justify; text-justify: inter-ideograph; }
.wn { /* 强制不换行 */
  word-wrap:normal;
  white-space:nowrap;
}
.wb { /* 强制换行 */
  white-space:normal;
  word-wrap:break-word;
  word-break:break-all;
}
.wp { /* 保持空白序列*/
  overflow:hidden;text-align:left;white-space:pre-wrap;word-wrap:break-word;word-break:break-all;
}
.wes { /* 多出部分用省略号表示 , 用于一行 */
  overflow:hidden;
  word-wrap:normal;
  white-space:nowrap;
  text-overflow:ellipsis;
}
.wes-2 { /* 适用于webkit内核和移动端 */
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
  overflow: hidden;
} 
.wes-3 {
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 3;
  overflow: hidden;
}
.wes-4 {
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 4;
  overflow: hidden;
}

/* 溢出样式 */
.ofh { overflow: hidden; }
.ofs {overflow: scroll; }
.ofa {overflow: auto; }
.ofv {overflow: visible; }

/* 定位方式 */
.ps {position: static; }
.pr {position: relative;zoom:1; }
.pa {position: absolute; }
.pf {position: fixed; }


/* 垂直对齐方式 */
.vt {vertical-align: top; }
.vm {vertical-align: middle; }
.vb {vertical-align: bottom; }


/* 鼠标样式 */
.csd {cursor: default; }
.csp {cursor: pointer; }
.csh {cursor: help; }
.csm {cursor: move; }

/* flex布局 */
.df-sb {
  display:flex;
  align-items: center;
  justify-content: space-between;
}
.df-sa {
  display:flex;
  align-items: center;
  justify-content: space-around;
}

/* 垂直居中 */
.df-c {
  display: flex;
  align-items: center;
  justify-content: center;
}
.tb-c {
  text-align:center;
  display:table-cell;
  vertical-align:middle;
}
.ts-c {
  position: absolute;
  left: 50%; top: 50%;
  transform: translate(-50%, -50%);
}
.ts-mc {
  position: absolute;
  left: 0;right: 0;
  bottom: 0; top: 0;
  margin: auto;
}

/* 辅助 */
.mask-fixed-wrapper {
  width: 100%;
  height: 100%;
  position: fixed;
  left:0;top:0;
  background: rgba(0, 0, 0, 0.65);
  z-index: 999;
}
.bg-cover {
  background-size: cover;
  background-repeat: no-repeat;
  background-position: center center;
}
.bg-cover-all {
  background-size: 100% 100%;
  background-repeat: no-repeat;
  background-position: center center;
}

以上都是经常用到的方法

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