文章详细讲解了浏览器优化 JavaScript 文件加载的逻辑，重点解析了 script 标签中 async 与 defer 属性的区别和作用。
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图文并茂的介绍了浏览器优化 js 文件加载的逻辑与细节，可以清楚的搞懂 script 标签 async 与 defer 属性的区别与作用。文章地址：https://mp.weixin.qq.com/s/8dboFtZJFMW4TQQb2AWkwg
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