Javascript Basics Tutorial: Lost Focus Event
The onblur event and onfocus are relative events. When the cursor leaves the currently focused object, the onblur event is triggered and the called program is executed at the same time.
Look at the following code:
<!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>When the text When the box loses focus, "Please enter username" will pop up
