$(function () {             //定义回车事件             if (document.addEventListener) {//如果是Firefox                 document.addEventListener("keypress", fireFoxHandler, true);             }             else {                 document.attachEvent("onkeypress", ieHandler);             }             function fireFoxHandler(evt) {                 if (evt.keyCode == 13) {                     $("#btnLogin")[0].click();                 }             }             function ieHandler(evt) {                 if (evt.keyCode == 13) {                     $("#btnLogin")[0].click();                 }             }         });