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<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>测试</title>
</head>
<body>
</body>
<script type="text/javascript" src="test.js">
</html>
document.write("<h1>你好</h1>")
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>1</title>
<style>
</style>
</head>
<body>
<script>
document.write("<h1>你好</h1>");
</script>
</body>
</html>
你的js 应该是路径引用错了