js 获取参数

 1 <html lang="en">
 2  <head>
 3   <meta charset="UTF-8">
 4   <meta name="Generator" content="EditPlus®">
 5   <meta name="Author" content="">
 6   <meta name="Keywords" content="">
 7   <meta name="Description" content="">
 8   <title>js_获取参数</title>
 9   <script>
10     function GetQueryString(name)
11     {
12          var reg = new RegExp("(^|&)"+ name +"=([^&]*)(&|$)");
13          var r = window.location.search.substr(1).match(reg);
14          if(r!=null)return  unescape(r[2]); return null;
15     }
16      
17     // 调用方法
18     alert(GetQueryString("a"));
19     alert(GetQueryString("b"));
20     alert(GetQueryString("c"));
21     //str.toLowerCase()   转换成小写  
22     //str.toUpperCase()   字符串全部转换成大写
23   </script>
24  </head>
25  <body>
26   
27  </body>
28 </html>