js 获取url参数(QueryString)

/// <summary> 
 
 
 

   /// 获取url参数 
 
 
 

   /// 王洪岐 
 
 
 

   /// </summary> 
 
 
 

   function QueryString(fieldName) { 
 
 
 

       var urlString = document.location.search; 
 
 
 

       if (urlString != null) { 
 
 
 

           var typeQu = fieldName + "="; 
 
 
 

           var urlEnd = urlString.indexOf(typeQu); 
 
 
 

           if (urlEnd != -1) { 
 
 
 

               var paramsUrl = urlString.substring(urlEnd + typeQu.length); 
 
 
 

               var isEnd = paramsUrl.indexOf('&'); 
 
 
 

               if (isEnd != -1) { 
 
 
 

                   return paramsUrl.substring(0, isEnd); 
 
 
 

               } 
 
 
 

               else { 
 
 
 

                   return paramsUrl; 
 
 
 

               } 
 
 
 

           } 
 
 
 

           else { 
 
 
 

               return null; 
 
 
 

           } 
 
 
 

       } 
 
 
 

       else { 
 
 
 

           return null; 
 
 
 

       } 
 
 
 

   }