之前做ES搜索的搜索框需要有自动补全功能，发现这个插件还不错，操作简单。
这是菜鸟链接：http://www.runoob.com/jqueryui/api-autocomplete.html#method-widget
样例
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>自动完成部件（Autocomplete Widget）演示</title>
<link rel="stylesheet" href="//apps.bdimg.com/libs/jqueryui/1.10.4/css/jquery-ui.min.css">
<script src="//apps.bdimg.com/libs/jquery/1.10.2/jquery.min.js"></script>
<script src="//apps.bdimg.com/libs/jqueryui/1.10.4/jquery-ui.min.js"></script>
</head>
<body>
<label for="autocomplete">选择一个编程语言：</label>
<input id="autocomplete">
<script>
$( "#autocomplete" ).autocomplete({
source: [ "c++", "java", "php", "coldfusion", "javascript", "asp", "ruby" ]
});
</script>
</body>
</html>