获取link后的参数值

getQueryString:function(name){
          var reg = new RegExp('(^|&)' + name + '=([^&]*)(&|$)', 'i');
          var r = window.location.search.substr(1).match(reg);
          if (r != null) {
              return unescape(r[2]);
          }
          return null;
      },