function getQueryStringArgs() {

     //取得查询字符串并去掉开头的问号

     var qs = (location.search.length > 0 ? location.search.substring(1) : "");

     //保存数据对象

     args = {};

     //取得每一项

     items = qs.length ? qs.split("&") : [],

     item = null;

     name = null;

     value = null;

     //for循环

     i = 0;

     len = items.length;

     //将每一项加入args对象中

     for (i = 0; i < len; i++) {

         item = items[i].split("=");

         name = decodeURIComponent(item[0]);

         value = decodeURIComponent(item[1]);

         if (name.length) {

             args[name] = value;

         }

     }

     return args;

 }

 //假设 ?q=javascript&num=10

 var args = getQueryStringArgs();

 alert(args["q"]);

 alert(args["num"]);