js中给回车键绑定事件响应函数

document.onkeydown = keyDown;//回车
function keyDown(e) {
	var e =e||event;
	var key=e.keyCode||e.which||e.charCode;
 	if(key==0xD){ //判断是否按下回车键
	        pro_submitForm(loginform);
	}
}