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);

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

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

/* 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); 
})()