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(function() {
    
  var newScript, load,
      firstScriptTag = document.getElementsByTagName('script')[0];
        
  load = function load(url) {
    newScript = document.createElement('script');
    newScript.async = true;
    newScript.src = url;
    firstScriptTag.parentNode.insertBefore(newScript, firstScriptTag);

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function QueryStringToJSON() {            
    var pairs = location.search.slice(1).split('&');
    
    var result = {};
    pairs.forEach(function(pair) {
        pair = pair.split('=');
        result[pair[0]] = decodeURIComponent(pair[1] || '');
    });

    return JSON.parse(JSON.stringify(result));

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@media only screen and (-webkit-min-device-pixel-ratio: 1.5), only screen and ( min--moz-device-pixel-ratio: 1.5), only screen and ( -o-min-device-pixel-ratio: 3/2), only screen and ( min-device-pixel-ratio: 1.5), only screen and (min-resolution: 192dpi) {
 /* Style Rules */ 
}

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function parseURL(url) {
  var a =  document.createElement('a');
  //创建一个链接
  a.href = url;
  return {
    source: url,
    protocol: a.protocol.replace(':',''),
    host: a.hostname,
    port: a.port,
    query: a.search,

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var addEvent,removeEvent;

addEvent = function(elm, evType, fn, useCapture) {
  if (elm.addEventListener) { 
    elm.addEventListener(evType, fn, useCapture);//DOM2.0 
    return true; 
  }else if (elm.attachEvent) { 
    var r = elm.attachEvent('on' + evType, fn);//IE5+ 
    return r; 
  }else { 

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function toggle(obj) {
  var el = document.getElementById(obj); 
    if ( el.style.display != 'none' ) { 
        el.style.display = 'none'; 
    } 
    else { 
      el.style.display = ''; 
    } 
}

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Array.prototype.inArray = function (value) {
  for (var i=0,l = this.length ; i <l ; i++) { 
    if (this === value) { 
      return true; 
    } 
  } 
  return false; 
};

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function getCookie( name ) {
  var start = document.cookie.indexOf( name + "=" ),
      len = start + name.length + 1,
      end = document.cookie.indexOf( ';', len );
      
  if ( ( !start ) && ( name != document.cookie.substring( 0, name.length ) ) ) { 
    return null; 
  } 
  if ( start === -1 ){
    return null;

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// 通过isEqual工具方法判断数值是否相等
function isEqual(number1, number2, digits){
	digits = digits === undefined? 10: digits; // 默认精度为10
	return number1.toFixed(digits) === number2.toFixed(digits);
}

isEqual(1.0-0.7, 0.3);  // return true

// 原生扩展方式，更喜欢面向对象的风格
Number.prototype.isEqual = function(number, digits){

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document.getElementById("myelement").addEventListener("click", handler);

// 处理器函数
function handler(e) {
    // 移除处理器
    e.target.removeEventListener(e.type, arguments.callee);

    alert("You'll only see this once!");
}