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<html lang="en"><head> <meta charset="UTF-8"> <title>Document</title></head><body><script> setTimeout(function(){ //延迟5秒 var body = document.getElementsByTagName(‘body‘)[0]; var scr = document.createElement(‘script‘);//创建一个script节点 scr.setAttribute(‘src‘,‘test1.js‘); //给script节点添加路径 body.appendChild(scr); },5000);</script></body></html>原文：https://www.cnblogs.com/niuxiaoxian/p/9443639.html