javascript 截取url参数

         var url="http://127.0.0.1:8080/photo/list.jsp?page=2&user=hongchen";
         var params_arr = url.substr(url.indexOf('?')+1).split("&");
         var params = new Array();
         for (var i = params_arr.length - 1; i >= 0; i--) {
             params[params_arr[i].split("=")[0]] = params_arr[i].split("=")[1];
         };
         alert(params["page"]);