Share a collection of commonly used js methods-JS Tutorial-php.cn

Share a collection of commonly used js methods

高洛峰

Release： 2017-03-12 14:09:27

Original

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This article mainly shares knowledge about commonly used js method collections. Has very good reference value. Let’s take a look with the editor below

ArrayandObjectDeep copy

var arr = [1,&#39;2&#39;,{a:1,b:[1,2]}];
function deepCopy(p, c) {　　　　
 var c = c || {};　　　　
 for (var i in p) {　　　　　　
 if (typeof p[i] === &#39;object&#39; && p[i] !== null) {　　c[i] = (p[i].constructor === Array) ? [] : {};　　　　deepCopy(p[i], c[i]);　　　　　　
 } else {　　　　　　　　　
  c[i] = p[i];　　　　　　
 }　　　　
 }　　　　
 return c;　　
}
var cArr = deepCopy(arr);
console.log(cArr);

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Get address bar parameters

function getUrlParam(){
 var _arr = location.search.substr(1).split(&#39;&&#39;);
 var _obj = {};
 for (var i = 0; i < _arr.length; i++) {
 _obj[_arr[i].split(&#39;=&#39;)[0]] = _arr[i].split(&#39;=&#39;)[1]
 };
 return _obj;
}
console.log(getUrlParam());

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Modify WeChat title compatible with ios

function changeWxTitle(text){
 var $body = $(&#39;body&#39;);
 document.title = text;
 var $iframe = $(&#39;<iframe src="/favicon.ico"></iframe>&#39;);
 $iframe.on(&#39;load&#39;,function() {
 setTimeout(function() {
  $iframe.off(&#39;load&#39;).remove();
 }, 0);
 }).appendTo($body);
}

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Mobile responsive style

/* 方法使用后会在 head标签添加一个style标签 并且有.my-resize 和 .no-resize的样式，需要适配屏幕的元素加上.my-resize类名即可，.no-resize是还原已适配的元素
 * window.onload = window.onresize = function(){
 *   pageResize({
 *     width : &#39;320&#39;,   //默认宽320px 
 *     height : &#39;504&#39;,   //默认高504px
 *   })
 *  }
 */
(function pageResize(opt) {
  var ua = navigator.userAgent,
    wp = ua.match(/Windows Phone ([\d.]+)/),
    android = ua.match(/(Android);?[\s\/]+([\d.]+)?/),
    // 设备宽高初始比例
    dw = document.documentElement.clientWidth,
    dh = document.documentElement.clientHeight,
    ds = dw / dh,
    // 页面宽高初始比例
    opt = opt || {},
    pw = opt.width || 320,
    ph = opt.height || 512,
    ps = pw / ph;
    // 核心代码：页面缩放比例
    var sx = dw/pw,
      sy = dh/ph; 
    var css = &#39;.no-resize { -webkit-transform: scaleY(&#39;+sx/sy+&#39;);transform: scaleY(&#39;+sx/sy+&#39;); }.my-resize { width:&#39;+pw+&#39;px !important;height:&#39;+ph+&#39;px !important;-webkit-transform: scale(&#39;+sx+&#39;,&#39;+sy+&#39;);transform: scale(&#39;+sx+&#39;,&#39;+sy+&#39;); -webkit-transform-origin:left top;transform-origin:left top;}&#39;,
    head = document.getElementsByTagName(&#39;head&#39;)[0],
    style = document.createElement(&#39;style&#39;);
    style.type = &#39;text/css&#39;;
    if(style.styleSheet){
      style.styleSheet.cssText = css;
    }else{
      style.appendChild(document.createTextNode(css));
    }
    head.appendChild(style); 
})()

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