Share a collection of commonly used js methods

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,'2',{a:1,b:[1,2]}];
function deepCopy(p, c) {　　　　
 var c = c || {};　　　　
 for (var i in p) {　　　　　　
 if (typeof p[i] === 'object' && 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);

Get address bar parameters

function getUrlParam(){
 var _arr = location.search.substr(1).split('&');
 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());

Modify WeChat title compatible with ios

function changeWxTitle(text){
 var $body = $('body');
 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);
}

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 : '320',   //默认宽320px 
 *     height : '504',   //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 = '.no-resize { -webkit-transform: scaleY('+sx/sy+');transform: scaleY('+sx/sy+'); }.my-resize { width:'+pw+'px !important;height:'+ph+'px !important;-webkit-transform: scale('+sx+','+sy+');transform: scale('+sx+','+sy+'); -webkit-transform-origin:left top;transform-origin:left top;}',
    head = document.getElementsByTagName('head')[0],
    style = document.createElement('style');
    style.type = 'text/css';
    if(style.styleSheet){
      style.styleSheet.cssText = css;
    }else{
      style.appendChild(document.createTextNode(css));
    }
    head.appendChild(style); 
})()

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