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<span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a></div> <!----></nav> <ul class="sidebar-links"><li><section class="sidebar-group depth-0"><p class="sidebar-heading open"><span>小蜜蜂前端周刊第四十八期</span> <!----></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/FE-Weekly/20191126.html#新鲜事" class="sidebar-link">新鲜事</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header"><a href="/FE-Weekly/20191126.html#chrome-dev-summit-2019-你需要知道关于前端性能的内容都在这里" class="sidebar-link">Chrome Dev Summit 2019，你需要知道关于前端性能的内容都在这里</a></li><li class="sidebar-sub-header"><a href="/FE-Weekly/20191126.html#top-level-await" class="sidebar-link">Top-level await</a></li></ul></li><li><a href="/FE-Weekly/20191126.html#阅读" class="sidebar-link">阅读</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header"><a href="/FE-Weekly/20191126.html#前端是什么鬼系列-messagechannel是什么鬼" class="sidebar-link">前端是什么鬼系列 -- MessageChannel是什么鬼</a></li><li class="sidebar-sub-header"><a href="/FE-Weekly/20191126.html#译-浏览器帧原理剖析" class="sidebar-link">[[译] 浏览器帧原理剖析](https://juejin.im/post/5c9c66075188251dab07413d)</a></li><li class="sidebar-sub-header"><a href="/FE-Weekly/20191126.html#你不知道的-requestidlecallback" class="sidebar-link">你不知道的 requestIdleCallback</a></li></ul></li></ul></section></li></ul> </aside> <main class="page"> <div class="theme-default-content content__default"><h1 id="小蜜蜂前端周刊第四十八期"><a href="#小蜜蜂前端周刊第四十八期" class="header-anchor">#</a> 小蜜蜂前端周刊第四十八期</h1> <h2 id="新鲜事"><a href="#新鲜事" class="header-anchor">#</a> 新鲜事</h2> <h3 id="chrome-dev-summit-2019-你需要知道关于前端性能的内容都在这里"><a href="#chrome-dev-summit-2019-你需要知道关于前端性能的内容都在这里" class="header-anchor">#</a> <a href="https://juejin.im/post/5dd6682e6fb9a05a7e67123b" target="_blank" rel="noopener noreferrer">Chrome Dev Summit 2019，你需要知道关于前端性能的内容都在这里<span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a></h3> <p>11月12日，一年一度的Chrome Developer Summit举行，会议主要会聚焦于前端相关的主题，例如PWA、用户体验、性能、安全与隐私等等。在两天的时间里，Chrome的内部开发人员分享了Chrome的生态系统，工具和方法的更新，用于帮助我们构建更好，更具吸引力体验的网站。 由于Google以及Chrome团队都非常重视速度，因此许多主题都是关于性能的。</p> <p>注：此文不是大会全部内容，具体内容可 youtobe 查询</p> <h3 id="top-level-await"><a href="#top-level-await" class="header-anchor">#</a> <a href="https://v8.dev/features/top-level-await" target="_blank" rel="noopener noreferrer">Top-level await<span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a></h3> <p>Top-level await enables developers to use the await keyword outside of async functions. It acts like a big async function causing other modules who import them to wait before they start evaluating their body.</p> <h2 id="阅读"><a href="#阅读" class="header-anchor">#</a> 阅读</h2> <h3 id="前端是什么鬼系列-messagechannel是什么鬼"><a href="#前端是什么鬼系列-messagechannel是什么鬼" class="header-anchor">#</a> <a href="https://github.com/jabez128/jabez128.github.io/issues/11" target="_blank" rel="noopener noreferrer">前端是什么鬼系列 -- MessageChannel是什么鬼<span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a></h3> <p>介绍 MessageChannel API 和用法</p> <h3 id="译-浏览器帧原理剖析"><a href="#译-浏览器帧原理剖析" class="header-anchor">#</a> <a href="https://juejin.im/post/5c9c66075188251dab07413d" target="_blank" rel="noopener noreferrer">[译] 浏览器帧原理剖析<span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a></h3> <p>开发者常常问我关于像素工作流程的某些部分，什么时候、为什么、发生了什么。所以我感觉值得提供一些参考，有关于将像素显示在屏幕上的过程里发生了什么。</p> <h3 id="你不知道的-requestidlecallback"><a href="#你不知道的-requestidlecallback" class="header-anchor">#</a> <a href="https://juejin.im/post/5c96294c5188252d5379e660" target="_blank" rel="noopener noreferrer">你不知道的 requestIdleCallback<span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a></h3> <p>本文副标题是 Request Schedule 源码解析一。在本章中会介绍 requestIdleCallback 的用法以及其缺陷, 接着对 React 团队对该 api 的 hack 部分的源码进行剖析。</p> <div class="gitalk-container"><div id="gitalk-container"></div></div></div> <footer class="page-edit"><!----> <div class="last-updated"><span class="prefix">最后更新:</span> <span class="time">2019/11/26 上午10:40:37</span></div></footer> <!----> </main></div><div class="global-ui"></div></div>
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