onfocus Cursor gathering event
Let’s write an example of cursor gathering event
The code is as follows:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>光标聚集事件</title>
</head>
<body>
<form>
来自：<select name="op" onfocus="onf()">
<option>安徽</option>
<option>池州</option>
<option>安庆</option>
<option>六安</option>
<option>阜阳</option>
</select>
</form>
<script type="text/javascript">
function onf(){
alert('请选择，您来自哪里');
}
</script>
</body>
</html>