摘要： 原文出处：http://www.kuqin.com/webpagedesign/20120208/317938.html 这个网站我自己先保存起来；有时间了慢慢看！我们常用的script标签，有两个和性能、js文件下载执行相关的属性：defer和asyncdefer的含义【摘自https://developer.mozilla.org/En/HTML/Element/Script】This Boolean attribute is set to indicate to a browser that the script is meant to be executed after the doc 阅读全文