Collection of commonly used js methods

Deep copy of arrays and objects

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('=')[0]] = _arr[i].split('=')[1]
 };
 return _obj;
}
console.log(getUrlParam());

Modify WeChat title compatible with ios

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);
}

Mobile responsive style

/*  Method is used in the  head Tag addition 1 A style Label   And there are .my-resize  And  .no-resize The style of, the elements that need to adapt to the screen are added .my-resize Class name will do, .no-resize Is to restore the adapted element 
 * window.onload = window.onresize = function(){
 *   pageResize({
 *     width : '320',   // Default width 320px 
 *     height : '504',   // Default height 504px
 *   })
 *  }
 */
(function pageResize(opt) {
  var ua = navigator.userAgent,
    wp = ua.match(/Windows Phone ([\d.]+)/),
    android = ua.match(/(Android);?[\s\/]+([\d.]+)?/),
    //  Initial ratio of width to height of equipment 
    dw = document.documentElement.clientWidth,
    dh = document.documentElement.clientHeight,
    ds = dw / dh,
    //  Initial ratio of page width to height 
    opt = opt || {},
    pw = opt.width || 320,
    ph = opt.height || 512,
    ps = pw / ph;
    //  Core code: Page scaling 
    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); 
})()