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第62天 有用过HTML5的WebWork吗?它主要解决了什么问题?
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用过, 做过一次IM系统 互相通讯, (解决长轮询/长连接等问题)
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用过一次 canvas 的 imageData 处理。 该期间也没啥别的交互,当时也没深究,还不清楚优劣。
主要解决了单线程的问题 由于js执行环境是单线程 所以当处理cpu密集型问题时就没办法了 这时候就可以使用webwork开启一个子线程进行处理
Web Worker 的作用,就是为 JavaScript 创造多线程环境,允许主线程创建 Worker 线程,将一些任务分配给后者运行。在主线程运行的同时,Worker 线程在后台运行,两者互不干扰。等到 Worker 线程完成计算任务,再把结果返回给主线程。这样的好处是,一些计算密集型或高延迟的任务,被 Worker 线程负担了,主线程(通常负责 UI 交互)就会很流畅,不会被阻塞或拖慢。
Worker 线程一旦新建成功,就会始终运行,不会被主线程上的活动(比如用户点击按钮、提交表单)打断。这样有利于随时响应主线程的通信。但是,这也造成了 Worker 比较耗费资源,不应该过度使用,而且一旦使用完毕,就应该关闭。
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第62天 有用过HTML5的WebWork吗?它主要解决了什么问题?
The text was updated successfully, but these errors were encountered: