html5 datalist应用

<form>
<input type="url" name="url" list="url_list">
<datalist id="url_list">
<option label="新浪" value="http://www.sina.com"/>
<option label="hao123" value="http://www.hao123.com"/>
<option label="qq" value="http://www.qq.com"/>
</datalist>
<input type="submit" value="提交">
</form>