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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>W3Cschool教程(w3cschool.cn)</title>
</head>
<body>
<h3>以下实例演示了如何访问 DATALIST 元素</h3>
<form>
<input list="myDatalist"> 
    <datalist id="myDatalist"> 
    <option value="Internet Explorer">
    <option value="Firefox">
    <option value="Chrome">
    <option value="Opera">
    <option value="Safari">
</datalist>
</form>
<p>点击按获取 datalist 元素中的选项的个数。</p>
<p id="demo"></p>
<button onclick="myFunction()">点我</button>
<p><strong>注意：</strong>  Internet Explorer 9 和更早IE版本，Safari浏览器均不支持 datalist 元素。</p>
<p><strong>注意：</strong>  input 元素的 list 属性与 datalist 元素绑定一起使用。</p>
<script>
function myFunction(){
    var x = document.getElementById("myDatalist").options.length;
    document.getElementById("demo").innerHTML="在列表中找到 " + x + " 选项。";
}
</script>
</body>
</html>
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