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<!DOCTYPE html>
<html class="theme-next pisces use-motion" lang="zh-Hans">
<head>
<meta charset="UTF-8"/>
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1"/>
<meta name="theme-color" content="#222">
<meta http-equiv="Cache-Control" content="no-transform" />
<meta http-equiv="Cache-Control" content="no-siteapp" />
<link href="/lib/fancybox/source/jquery.fancybox.css?v=2.1.5" rel="stylesheet" type="text/css" />
<link href="/lib/font-awesome/css/font-awesome.min.css?v=4.6.2" rel="stylesheet" type="text/css" />
<link href="/css/main.css?v=5.1.4" rel="stylesheet" type="text/css" />
<link rel="apple-touch-icon" sizes="180x180" href="/images/apple-touch-icon-next.png?v=5.1.4">
<link rel="icon" type="image/png" sizes="32x32" href="/images/favicon-32x32-next.png?v=5.1.4">
<link rel="icon" type="image/png" sizes="16x16" href="/images/favicon-16x16-next.png?v=5.1.4">
<link rel="mask-icon" href="/images/logo.svg?v=5.1.4" color="#222">
<link rel="manifest" href="/images/manifest.json">
<meta name="msapplication-config" content="/images/browserconfig.xml" />
<meta name="keywords" content="Free, Breave" />
<meta name="description" content="自由, 勇敢">
<meta property="og:type" content="website">
<meta property="og:title" content="Mars">
<meta property="og:url" content="http://yoursite.com/">
<meta property="og:site_name" content="Mars">
<meta property="og:description" content="自由, 勇敢">
<meta property="article:author" content="Mars">
<meta name="twitter:card" content="summary">
<script type="text/javascript" id="hexo.configurations">
var NexT = window.NexT || {};
var CONFIG = {
root: '/',
scheme: 'Pisces',
version: '5.1.4',
sidebar: {"position":"left","display":"post","offset":12,"b2t":true,"scrollpercent":true,"onmobile":false},
fancybox: true,
tabs: true,
motion: {"enable":true,"async":false,"transition":{"post_block":"fadeIn","post_header":"slideDownIn","post_body":"slideDownIn","coll_header":"slideLeftIn","sidebar":"slideUpIn"}},
duoshuo: {
userId: '0',
author: '博主'
},
algolia: {
applicationID: '',
apiKey: '',
indexName: '',
hits: {"per_page":10},
labels: {"input_placeholder":"Search for Posts","hits_empty":"We didn't find any results for the search: ${query}","hits_stats":"${hits} results found in ${time} ms"}
}
};
</script>
<link rel="canonical" href="http://yoursite.com/"/>
<title>Mars</title>
<meta name="generator" content="Hexo 4.2.0"></head>
<body itemscope itemtype="http://schema.org/WebPage" lang="zh-Hans">
<div class="container sidebar-position-left
page-home">
<div class="headband"></div>
<header id="header" class="header" itemscope itemtype="http://schema.org/WPHeader">
<div class="header-inner"><div class="site-brand-wrapper">
<div class="site-meta ">
<div class="custom-logo-site-title">
<a href="/" class="brand" rel="start">
<span class="logo-line-before"><i></i></span>
<span class="site-title">Mars</span>
<span class="logo-line-after"><i></i></span>
</a>
</div>
<h1 class="site-subtitle" itemprop="description"></h1>
</div>
<div class="site-nav-toggle">
<button>
<span class="btn-bar"></span>
<span class="btn-bar"></span>
<span class="btn-bar"></span>
</button>
</div>
</div>
<nav class="site-nav">
<ul id="menu" class="menu">
<li class="menu-item menu-item-home">
<a href="/" rel="section">
<i class="menu-item-icon fa fa-fw fa-question-circle"></i> <br />
首页
</a>
</li>
<li class="menu-item menu-item-tags">
<a href="/tags" rel="section">
<i class="menu-item-icon fa fa-fw fa-question-circle"></i> <br />
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</a>
</li>
<li class="menu-item menu-item-categories">
<a href="/categories" rel="section">
<i class="menu-item-icon fa fa-fw fa-question-circle"></i> <br />
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</a>
</li>
<li class="menu-item menu-item-archives">
<a href="/archives" rel="section">
<i class="menu-item-icon fa fa-fw fa-question-circle"></i> <br />
归档
</a>
</li>
<li class="menu-item menu-item-commonweal">
<a href="/404" rel="section">
<i class="menu-item-icon fa fa-fw fa-question-circle"></i> <br />
公益404
</a>
</li>
</ul>
</nav>
</div>
</header>
<main id="main" class="main">
<div class="main-inner">
<div class="content-wrap">
<div id="content" class="content">
<section id="posts" class="posts-expand">
<article class="post post-type-normal" itemscope itemtype="http://schema.org/Article">
<div class="post-block">
<link itemprop="mainEntityOfPage" href="http://yoursite.com/%E4%B8%BA%E4%BB%80%E4%B9%88-setstate-%E6%98%AF%E5%BC%82%E6%AD%A5%E7%9A%84/">
<span hidden itemprop="author" itemscope itemtype="http://schema.org/Person">
<meta itemprop="name" content="Mars">
<meta itemprop="description" content="">
<meta itemprop="image" content="/images/avatar.jpg">
</span>
<span hidden itemprop="publisher" itemscope itemtype="http://schema.org/Organization">
<meta itemprop="name" content="Mars">
</span>
<header class="post-header">
<h2 class="post-title" itemprop="name headline">
<a class="post-title-link" href="/%E4%B8%BA%E4%BB%80%E4%B9%88-setstate-%E6%98%AF%E5%BC%82%E6%AD%A5%E7%9A%84/" itemprop="url">为什么 SetState 是异步的</a></h2>
<div class="post-meta">
<span class="post-time">
<span class="post-meta-item-icon">
<i class="fa fa-calendar-o"></i>
</span>
<span class="post-meta-item-text">发表于</span>
<time title="创建于" itemprop="dateCreated datePublished" datetime="2020-08-02T16:51:15+08:00">
2020-08-02
</time>
</span>
<span class="post-category" >
<span class="post-meta-divider">|</span>
<span class="post-meta-item-icon">
<i class="fa fa-folder-o"></i>
</span>
<span class="post-meta-item-text">分类于</span>
<span itemprop="about" itemscope itemtype="http://schema.org/Thing">
<a href="/categories/React/" itemprop="url" rel="index">
<span itemprop="name">React</span>
</a>
</span>
</span>
<span class="post-comments-count">
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<span class="post-comments-count disqus-comment-count"
data-disqus-identifier="为什么-setstate-是异步的/" itemprop="commentCount"></span>
</a>
</span>
<span id="/%E4%B8%BA%E4%BB%80%E4%B9%88-setstate-%E6%98%AF%E5%BC%82%E6%AD%A5%E7%9A%84/" class="leancloud_visitors" data-flag-title="为什么 SetState 是异步的">
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</header>
<div class="post-body" itemprop="articleBody">
<h3 id="为什么-setState-是异步的-？"><a href="#为什么-setState-是异步的-？" class="headerlink" title="为什么 setState 是异步的 ？"></a>为什么 setState 是异步的 ？</h3><blockquote>
<p><a href="https://github.com/facebook/react/issues/11527" target="_blank" rel="noopener">原文链接</a></p>
</blockquote>
<p>这篇文章是 github 中 react 的一个 issue 之前被其出来了，然后 <a href="https://github.com/gaearon" target="_blank" rel="noopener">gaearon</a> （Redux 核心开发者）回答了该问题。</p>
<p>他主要从两个方面去阐述了这个问题</p>
<ul>
<li>保证数据的一致性</li>
<li>使并发更新成为可能</li>
</ul>
<p>以下是他的原文：</p>
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<footer class="post-footer">
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<div class="post-block">
<link itemprop="mainEntityOfPage" href="http://yoursite.com/chrome-%E6%B5%8F%E8%A7%88%E5%99%A8%E6%8F%92%E4%BB%B6/">
<span hidden itemprop="author" itemscope itemtype="http://schema.org/Person">
<meta itemprop="name" content="Mars">
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<meta itemprop="name" content="Mars">
</span>
<header class="post-header">
<h2 class="post-title" itemprop="name headline">
<a class="post-title-link" href="/chrome-%E6%B5%8F%E8%A7%88%E5%99%A8%E6%8F%92%E4%BB%B6/" itemprop="url">Chrome 浏览器插件</a></h2>
<div class="post-meta">
<span class="post-time">
<span class="post-meta-item-icon">
<i class="fa fa-calendar-o"></i>
</span>
<span class="post-meta-item-text">发表于</span>
<time title="创建于" itemprop="dateCreated datePublished" datetime="2020-08-02T16:40:47+08:00">
2020-08-02
</time>
</span>
<span class="post-category" >
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<span class="post-meta-item-icon">
<i class="fa fa-folder-o"></i>
</span>
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<span itemprop="about" itemscope itemtype="http://schema.org/Thing">
<a href="/categories/Chrome/" itemprop="url" rel="index">
<span itemprop="name">Chrome</span>
</a>
</span>
</span>
<span class="post-comments-count">
<span class="post-meta-divider">|</span>
<span class="post-meta-item-icon">
<i class="fa fa-comment-o"></i>
</span>
<a href="/chrome-%E6%B5%8F%E8%A7%88%E5%99%A8%E6%8F%92%E4%BB%B6/#comments" itemprop="discussionUrl">
<span class="post-comments-count disqus-comment-count"
data-disqus-identifier="chrome-浏览器插件/" itemprop="commentCount"></span>
</a>
</span>
<span id="/chrome-%E6%B5%8F%E8%A7%88%E5%99%A8%E6%8F%92%E4%BB%B6/" class="leancloud_visitors" data-flag-title="Chrome 浏览器插件">
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</span>
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</span>
</div>
</header>
<div class="post-body" itemprop="articleBody">
<h1 id="Chrom-浏览器插件"><a href="#Chrom-浏览器插件" class="headerlink" title="Chrom 浏览器插件"></a>Chrom 浏览器插件</h1><h2 id="使用-场景"><a href="#使用-场景" class="headerlink" title="使用 场景"></a>使用 场景</h2><h3 id="把自己-已装的插件信息发送给朋友"><a href="#把自己-已装的插件信息发送给朋友" class="headerlink" title="把自己 已装的插件信息发送给朋友"></a>把自己 已装的插件信息发送给朋友</h3><h4 id="怎么找到-自己-谷歌装的插件的位置"><a href="#怎么找到-自己-谷歌装的插件的位置" class="headerlink" title="怎么找到 自己 谷歌装的插件的位置"></a>怎么找到 自己 谷歌装的插件的位置</h4><ol>
<li>在浏览器 里面输入 chrome://version/ </li>
</ol>
<p><img src="https://cdn.nlark.com/yuque/0/2020/png/1636987/1596083145986-741a8475-011b-40aa-b934-a85750fbc44f.png" alt="image.png"></p>
<p> 一般会保存在 个人资料路径里面</p>
<ol>
<li>找到 后 出现在 Extensions 里面</li>
</ol>
<p><img src="https://cdn.nlark.com/yuque/0/2020/png/1636987/1596082989048-29196024-034e-43a1-9f6a-602b49636ff5.png" alt="image.png"></p>
<ol>
<li>点进去之后我们发现一大堆 长串字符串 文件 ， 看不懂， 找不到 咋办 ？ </li>
</ol>
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<a class="post-title-link" href="/%E4%B8%A5%E6%A0%BC%E6%A8%A1%E5%BC%8F/" itemprop="url">严格模式</a></h2>
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<h2 id="严格模式"><a href="#严格模式" class="headerlink" title="严格模式"></a>严格模式</h2><p>[TOC]</p>
<p>我们都知道在 ES6 中 开始引入了严格模式，然后它有一些规则， 能让我们在写代码时提早知道代码中出现的错误，以及可能导致编程出错的 行为。</p>
<h3 id="使用"><a href="#使用" class="headerlink" title="使用"></a>使用</h3><p>在文件的开头 或者全局作用域中使用 字符串</p>
<figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><code class="hljs bash"><span class="hljs-string">"use static"</span><br></code></pre></td></tr></table></figure>
<p>当然也能在 函数内部使用 </p>
<p>当 JS 引擎遇到这个语法的时候就会启动这种模式。 然后当遇到不支持的浏览器时， 解析为一个普通字符串字面量</p>
<h3 id="相关规则"><a href="#相关规则" class="headerlink" title="相关规则"></a>相关规则</h3><h4 id="1-变量"><a href="#1-变量" class="headerlink" title="1. 变量"></a>1. 变量</h4>
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<h2 id="小程序中使用echart"><a href="#小程序中使用echart" class="headerlink" title="小程序中使用echart"></a>小程序中使用echart</h2><p>最近有几个小程序用到了图表，把我一顿折腾。所以来讲一下使用图表时所遇到的问题。</p>
<p>我们所用到的是<a href="https://github.com/ecomfe/echarts-for-weixin" target="_blank" rel="noopener">ECharts 的微信小程序版本</a>;它提供了一个小程序原生的组件，然后我们只需要在相关页面引用改组件就好了。</p>
<h4 id="使用前准备"><a href="#使用前准备" class="headerlink" title="使用前准备"></a>使用前准备</h4><ol>
<li><p>先下载<a href="https://github.com/ecomfe/echarts-for-weixin" target="_blank" rel="noopener">ecomfe/echarts-for-weixin</a> 中 ec-canvas 整个文件夹里面的文件</p>
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