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WindRunnerMaxWindRunnerMax
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21/04/18
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‎JavaScript/Js文件异步加载.md‎

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`defer`是早期`IE`支持的属性，目前主流浏览器都已经支持，该属性会使浏览器开启一个线程去加载`Js`并且会在`DOM`结构解析完成之后再执行。
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* `defer`只适用于外联脚本。
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* 如果有多个声明了`defer`的脚本，则会按顺序下载和执行。
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* `defer`脚本会在`onDOMContentLoaded`之后和`onload`事件之前执行。
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* `defer`脚本会在`onDOMContentLoaded`之前执行，当然同样也就在`onload`事件之前执行。
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```html
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<!-- 兼容性 https://caniuse.com/#feat=script-defer -->
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```
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https://segmentfault.com/a/1190000006778717
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https://www.cnblogs.com/jiasm/p/7683930.html
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https://blog.csdn.net/zyj0209/article/details/79698430
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https://blog.csdn.net/qq_41245969/article/details/82428464
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```

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