url字符串和对象之间的转换

 1 var urlToObj = function (){
 2    var search = this.replace(/^\s+|\s+$/, ‘‘).match(/([^?#]*)(#.*)?$/);     
 3     if( !search ){
 4         return {};     
 5     }
 6      
 7     var searchHash = search[1].split(‘&‘);
 8     var obj = {};
 9     
10     for(var i = 0, len = searchHash.length; i<len; i++){
11          var pair = searchHash[i].split(‘=‘);
12          if(pair[0]){
13             var key = decodeURIComponent(pair[0]);
14             var value = pair[1];
15             if(value != undefined ){
16                 value = decodeURICoponent(value);
17             }
18             //这里判断转化后的obj里面有没有重复的属性
19             if( key in obj ){
20                 if( obj [key] != Array ){
21                     //把属性值变为数组，将另外的属性值也存放到数组中去
22                     obj [key] = [obj [key]];
23                 }
24                 obj [key].push(value);
25             }else{
26                  obj [key] = value;
27             }
28          }
29     }
30 
31     return obj;
32 };          
33 
34 //调用可以如下
35  urlToObj.call( location.search );