html 按Enter后,自动触发指定button的click事件 在谷歌好用

<! DOCTYPE  html  PUBLIC  "-//W3C// DTD   XHTML  1.0  Tr ansitional//EN" " http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd "> 
<html xmlns=" http://www.w3.org/1999/xhtml "> 
<head> 
<meta http-equiv="Content-Type" content="text/html; charset= GBK " /> 

<script type="text/javascript"> 
<!--
function clickEnter(){
alert('button enter is clicked!');
} 
function _key() { 
if(event.keyCode ==13) 
clickEnter(); 
} 
//-->
</script> 

</head> 

<body onkeydown="_key()"> 
<input type="button" id="enter" value="enter" onclick="clickEnter()"/> 
<input type="button" value="123" onclick="alert('123');" /> 
</body> 
</html>