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为什么JavaScript是单线程？ #34

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koala-coding opened this issue Dec 18, 2019 · 0 comments
Open

为什么JavaScript是单线程？ #34

koala-coding opened this issue Dec 18, 2019 · 0 comments
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javascript javascript相关知识

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@koala-coding
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js最初设计是运行在浏览器中,单线程是为了防止DOM渲染冲突问题
比如有这样一个场景: 假设有2个线程, 当它们同时对同一个DON进行操作, 一个进行修改,而另一个进行删除, 此时就会产生冲突 所以为了避免出现这样的冲突, javascript从一诞生就是单线程.
但是呢单线程始终是一个痛点, 为了利用多核 CPU 的计算能力，HTML5 提出 Web Worker 标准，允许 JavaScript 脚本创建多个线程。但是子线程完全受主线程控制，且不得操作 DOM
@koala-coding koala-coding added the javascript javascript相关知识 label Dec 18, 2019
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