javascript创建DOM元素，标签script并追加到title标签中
html代码
<!doctype html>
<html >
<head>
<meta charset="UTF-8">
<meta name="viewport"
content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title></title>
</head>javascript代码
let tag = document.createElement('script');
tag.src = 'http://127.0.0.1:8080/index.html';
$(document.title).append(tag);