test.js
document.writeln("虾米大王，从0到1教程"+"<br>");t326.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<script src="../../js/jquery-3.5.1.js"></script>
<script>
//$.getScript()方法
$(function () {
$("#btn1").click(function () {
$.getScript("test.js");
});
});
</script>
</head>
<body>
<input type="button" id="btn1" value="加载">
</body>
</html>