// 获取url中的参数，并返回一个对象

 $.getRequestData = function() {

     var url = location.search; //获取url中"?"符后的字串

     var theRequest = {};

     if (url.indexOf("?") != -1) {

         var str = url.substr(1);

         strs = str.split("&");

         for (var i = 0; i < strs.length; i++) {

             theRequest[strs[i].split("=")[0]] = decodeURIComponent(strs[i].split("=")[1]);

         }

     }

     return theRequest;

 };

 // 生成一个带参数的url

 $.createUrl = function(obj) {

     var length = obj && obj.length,

         idx = 0,

         url = obj.url + '?';

     for (var key in obj) {

         if (key != 'url' && obj[key] !== null) {

             url += (key + '=' + encodeURIComponent(obj[key]) + '&');

         }

     }

     return url.substring(0, url.lastIndexOf('&'));

 }