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class="sidebar-sub-header"><a href="/FE-Weekly/20190428.html#由settimeout引发的" class="sidebar-link">由SetTimeout引发的</a></li><li class="sidebar-sub-header"><a href="/FE-Weekly/20190428.html#纯css画三角形" class="sidebar-link">纯css画三角形</a></li><li class="sidebar-sub-header"><a href="/FE-Weekly/20190428.html#使用css画三条横线的菜单栏图标" class="sidebar-link">使用css画三条横线的菜单栏图标</a></li><li class="sidebar-sub-header"><a href="/FE-Weekly/20190428.html#img图片定宽高不变形裁剪" class="sidebar-link">img图片定宽高不变形裁剪</a></li></ul></li><li><a href="/FE-Weekly/20190428.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/20190428.html#create-react-app-3-0-版本已经发布" class="sidebar-link">create-react-app 3.0 版本已经发布</a></li></ul></li><li><a href="/FE-Weekly/20190428.html#react" class="sidebar-link">React</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header"><a href="/FE-Weekly/20190428.html#为什么我们要写-super-props" class="sidebar-link">为什么我们要写 super(props) ？</a></li><li class="sidebar-sub-header"><a href="/FE-Weekly/20190428.html#react-如何区分-class-和-function" class="sidebar-link">React 如何区分 Class 和 Function？</a></li><li class="sidebar-sub-header"><a href="/FE-Weekly/20190428.html#yck-的-react-源码解读课-先热个身" class="sidebar-link">YCK 的 React 源码解读课 —— 先热个身</a></li></ul></li><li><a href="/FE-Weekly/20190428.html#js" class="sidebar-link">JS</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header"><a href="/FE-Weekly/20190428.html#_7-useful-javascript-tricks" class="sidebar-link">7 Useful JavaScript Tricks</a></li></ul></li></ul></section></li></ul> </aside> <main class="page"> <div class="theme-default-content content__default"><h1 id="小蜜蜂前端周刊第二十四期"><a href="#小蜜蜂前端周刊第二十四期" class="header-anchor">#</a> 小蜜蜂前端周刊第二十四期</h1> <p><strong>本期文章由 张紫月、徐梦婷、仲晚秋 供稿</strong></p> <h2 id="个人"><a href="#个人" class="header-anchor">#</a> 个人</h2> <h3 id="usr-bin-env-node-到底是什么"><a href="#usr-bin-env-node-到底是什么" class="header-anchor">#</a> <a href="https://juejin.im/post/5cb93cd651882578b148c637" target="_blank" rel="noopener noreferrer">#!/usr/bin/env node 到底是什么？<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> <ul><li>推荐理由: 在npm包的index.js的文件第一行有这样一段代码#!/usr/bin/env node，它到底是什么？这篇文章来为大家解答一下这个疑惑。</li> <li>推荐人: 张紫月</li></ul> <h3 id="由settimeout引发的"><a href="#由settimeout引发的" class="header-anchor">#</a> <a href="https://www.jianshu.com/p/cd6c397578d4" target="_blank" rel="noopener noreferrer">由SetTimeout引发的<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> <ul><li>推荐理由: 了解setTimeout，Promise的代码执行先后顺序。</li> <li>推荐人: 徐梦婷</li></ul> <h3 id="纯css画三角形"><a href="#纯css画三角形" class="header-anchor">#</a> <a href="https://yomizhong.github.io/2019/04/26/%E7%BA%AFcss%E7%94%BB%E4%B8%89%E8%A7%92%E5%BD%A2/#more" target="_blank" rel="noopener noreferrer">纯css画三角形<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> <ul><li>推荐理由: 本文分享使用css画三角形及实现对话框效果</li> <li>推荐人: 仲晚秋</li></ul> <h3 id="使用css画三条横线的菜单栏图标"><a href="#使用css画三条横线的菜单栏图标" class="header-anchor">#</a> <a href="https://yomizhong.github.io/2019/04/26/%E4%BD%BF%E7%94%A8css%E7%94%BB%E4%B8%89%E6%9D%A1%E6%A8%AA%E7%BA%BF%E7%9A%84%E8%8F%9C%E5%8D%95%E6%A0%8F%E5%9B%BE%E6%A0%87/#more" target="_blank" rel="noopener noreferrer">使用css画三条横线的菜单栏图标<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> <ul><li>推荐理由: 本文分享css实现三条横线的两种画法</li> <li>推荐人: 仲晚秋</li></ul> <h3 id="img图片定宽高不变形裁剪"><a href="#img图片定宽高不变形裁剪" class="header-anchor">#</a> <a href="https://yomizhong.github.io/2019/04/26/img%E5%9B%BE%E7%89%87%E5%AE%9A%E5%AE%BD%E9%AB%98%E4%B8%8D%E5%8F%98%E5%BD%A2%E8%A3%81%E5%89%AA/#more" target="_blank" rel="noopener noreferrer">img图片定宽高不变形裁剪<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> <ul><li>推荐理由: 本文分享object-fit属性的应用</li> <li>推荐人: 仲晚秋</li></ul> <h2 id="新鲜事"><a href="#新鲜事" class="header-anchor">#</a> 新鲜事</h2> <h3 id="create-react-app-3-0-版本已经发布"><a href="#create-react-app-3-0-版本已经发布" class="header-anchor">#</a> <a href="https://github.com/facebook/create-react-app/releases/tag/v3.0.0" target="_blank" rel="noopener noreferrer">create-react-app 3.0 版本已经发布<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> <ul><li>推荐理由: create-react-app 3.0 带来一些令人激动的新特性，包括 hooks。</li></ul> <h2 id="react"><a href="#react" class="header-anchor">#</a> React</h2> <h3 id="为什么我们要写-super-props"><a href="#为什么我们要写-super-props" class="header-anchor">#</a> <a href="https://overreacted.io/why-do-we-write-super-props/" target="_blank" rel="noopener noreferrer">为什么我们要写 super(props) ？<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> <ul><li>推荐理由: 为什么我们要调用 super，我们可以不这么做吗？那么在我们调用它时不传入 props，又会发生什么呢？会有其他的缺省参数吗？接来下我们就解开这一系列谜题。</li></ul> <h3 id="react-如何区分-class-和-function"><a href="#react-如何区分-class-和-function" class="header-anchor">#</a> <a href="https://overreacted.io/zh-hans/how-does-react-tell-a-class-from-a-function/" target="_blank" rel="noopener noreferrer">React 如何区分 Class 和 Function？<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> <ul><li>推荐理由: 这篇文章主要介绍 React 是如何区分 Class 和 Function。值得一读。</li></ul> <h3 id="yck-的-react-源码解读课-先热个身"><a href="#yck-的-react-源码解读课-先热个身" class="header-anchor">#</a> <a href="https://juejin.im/post/5cbae9a8e51d456e2809fba3" target="_blank" rel="noopener noreferrer">YCK 的 React 源码解读课 —— 先热个身<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> <ul><li>推荐理由: React 源码解读。喜欢扒源码的同学可以看过来了。</li></ul> <h2 id="js"><a href="#js" class="header-anchor">#</a> JS</h2> <h3 id="_7-useful-javascript-tricks"><a href="#_7-useful-javascript-tricks" class="header-anchor">#</a> <a href="https://davidwalsh.name/javascript-tricks" target="_blank" rel="noopener noreferrer">7 Useful JavaScript Tricks<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> <ul><li>推荐理由: 7 个有用的 JavaScript 小技巧。</li></ul> <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">2021/12/10 上午10:52:50</span></div></footer> <!----> </main></div><div class="global-ui"></div></div>
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