請問這樣子為什么不能觸發鼠標事件？
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>鼠標移開事件 </title>
<script type="text/javascript">
? var name=document.getElementById("first");
? name.onmouseout=function(){
? ? ? alert("相信我，frighting");
? }
</script>
</head>
<body>
<form id="first">
? <a href="http://www.xianlaiwan.cn">點擊我</a>
</form>
</body>
</html>
2018-10-25
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>鼠標移開事件 </title>
<script type="text/javascript">
? function message(){
? ? alert("不要移開，點擊后進行慕課網!"); }
</script>
</head>
<body>
<form>
? <a href="http://www.xianlaiwan.cn" onmouseout="message()">點擊我</a>
</form>
</body>
</html>
2018-07-04
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>鼠標移開事件 </title>
<script type="text/javascript">
window.onload = function() {
var name = document.getElementById("first");
name.onmouseout = function () {
alert("相信我，frighting");
}
}
</script>
</head>
<body>
<form id="first">
<a href="http://www.xianlaiwan.cn">點擊我</a>
</form>
</body>
</html>
2018-06-28
1111