<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//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=utf-8" />
<title>无标题文档</title>
</head>
<body>
<form>
<input name="" type="text" />
<input name="" type="text" /><input name="" type="text" /><input name="" type="text" /><input name="" type="text" /><input name="" type="text" />
<input name="" type="text" /><input type="button" /><input type="password" />
</form>
</body>
</html>
<script language="javascript">
document.onkeydown=function(evt){
//document.all可以判断浏览器是否是IE，是页面内所有元素的一个集合
var isie = (document.all) ? true : false;
var key;
var srcobj;
// if the agent is an IE browser, it's easy to do this.
if (isie) {
key = event.keyCode;
srcobj=event.srcElement;//event.srcElement，触发这个事件的源对象
}
else {
key = evt.which;
srcobj=evt.target;//target是Firefox下的属性
}
if(key==13 && srcobj.type!='button' && srcobj.type!='submit' &&srcobj.type!='reset' && srcobj.type!='textarea' && srcobj.type!='') {
if(isie)
event.keyCode=9;//设置按键为tab键
else {
var el=getNextElement(evt.target);
if (el.type!='hidden')
; //nothing to do here.
else
while(el.type=='hidden')
el=getNextElement(el);
if(!el)
return false;
else
el.focus();
}
}
}
function getNextElement(field) {
var form = field.form;
for(var e = 0; e < form.elements.length; e++) {
if (field == form.elements[e])
break;
}
return form.elements[++e % form.elements.length];
}
</script>