外部Javascr ipt文件块下载和伤害你的页面的性能，但有一个简单的方法来解决此问题：并行使用动态脚本标记和加载脚本，提高页面加载速度和用户体验。

The problem: scr ipts block downloads Let’s first take a look at what the problem is with the scr ipt downloads. The thing is that before fully downloading and parsing a scr ipt, the browser can’t tell what’s in it. It may contain [removed]() calls w