点击input框出现下拉,该怎么实现
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<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>test</title>
</head>
<select id="sel" onChange="return select()">
<option></option>
<option>Chinese</option>
<option>English</option>
<option>math</option>
</select>
<script>
function select(){
var index = document.getElementById('sel').selectedIndex;
alert(index)
}
</script>
<body>
</body>
</html>
<html>
<head>
<meta charset="utf-8">
<title>test</title>
</head>
<select id="sel" onChange="return select()">
<option></option>
<option>Chinese</option>
<option>English</option>
<option>math</option>
</select>
<script>
function select(){
var index = document.getElementById('sel').selectedIndex;
alert(index)
}
</script>
<body>
</body>
</html>
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