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Javascript ?? ????: Lost Focus ???

onblur ???? onfocus? ???? ??????. ??? ?? ???? ??? ???? onblur ???? ????? ??? ????? ??? ?????.

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<!DOCTYPE html>
<html>
<head>
	<meta charset="utf-8">
	<title>失去焦點(diǎn)事件</title>
</head>
<body>
	<form>
		請輸入你的身份證號：<input type="text" onblur="onf()">
	</form>

	<script type="text/javascript">
			function onf(){
				alert('請輸入用戶名');
			}
	</script>
</body>
</html>

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???? ??
||
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>失去焦點(diǎn)事件</title> </head> <body> <form> 請輸入你的身份證號：<input type="text" onblur="onf()"> </form> <script type="text/javascript"> function onf(){ alert('請輸入用戶名'); } </script> </body> </html>