<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>菜鸟教程(runoob.com)</title>
<script src="https://cdn.staticfile.net/jquery/2.2.4/jquery.min.js">
</script>
</head>
<body>
<h1>使用 jQuery 输出 Hello World</h1>
<p></p>
</body>
</html>
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$(document).ready(function(){
$("p").text("Hello World!");
});
h1 {
color:red;
}