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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<input type="text" id="account">
<h2 id="result"></h2>
<script type="text/javascript">
document.getElementById('account').onblur=function(e){
if(e.target.value.length<5){
document.getElementById('result').innerHTML='不得小於五';
}else{
document.getElementById('result').innerHTML='';
}
}
</script>
</body>
</html>
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