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<article id="post-djangoandmysql" class="article is-index article-post article-type-post" itemscope="" itemprop="blogPost">
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<time datetime="2019-04-14T11:33:04.000Z" itemprop="datePublished">2019-04-14</time>
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<a class="article-category-link" href="/categories/django/">django</a>
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<a class="article-title" href="/2019/04/14/djangoandmysql/">django 与 mysql 勾结指南</a>
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<hr>
<blockquote>
<p>📖 阅读本文大概需要 26 分钟。</p>
</blockquote>
<p>参考文章：</p>
<p><a href="https://blog.51cto.com/eagle6899/2146972" target="_blank" rel="noopener">https://blog.51cto.com/eagle6899/2146972</a></p>
<p><a href="https://blog.csdn.net/qq_36963372/article/details/82558085" target="_blank" rel="noopener">https://blog.csdn.net/qq_36963372/article/details/82558085</a></p>
<h4 id="第一步：配置-setting-py"><a href="#第一步：配置-setting-py" class="headerlink" title="第一步：配置 setting.py"></a>第一步：配置 setting.py</h4><figure class="highlight python"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment"># Database</span></span><br><span class="line"><span class="comment"># https://docs.djangoproject.com/en/2.2/ref/settings/#databases</span></span><br><span class="line"></span><br><span class="line">DATABASES = {</span><br><span class="line"> <span class="string">'default'</span>: {</span><br><span class="line"> <span class="comment"># 'ENGINE': 'django.db.backends.sqlite3',</span></span><br><span class="line"> <span class="comment"># 'NAME': os.path.join(BASE_DIR, 'db.sqlite3'),</span></span><br><span class="line"> </span><br><span class="line"> <span class="string">'ENGINE'</span>: <span class="string">'django.db.backends.mysql'</span>,</span><br><span class="line"> <span class="string">'NAME'</span>: <span class="string">'mydatabase'</span>,</span><br><span class="line"> <span class="string">'USER'</span>: <span class="string">'root'</span>,</span><br><span class="line"> <span class="string">'PASSWORD'</span>: <span class="string">'root'</span>,</span><br><span class="line"> <span class="string">'HOST'</span>: <span class="string">'127.0.0.1'</span>,</span><br><span class="line"> <span class="string">'PORT'</span>: <span class="string">'3306'</span>,</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<h4 id="第二步：执行-migrate"><a href="#第二步：执行-migrate" class="headerlink" title="第二步：执行 migrate"></a>第二步：执行 migrate</h4><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">$ python manage.py migrate</span><br></pre></td></tr></table></figure>
<p>不出意外会让你安装 <code>mysqlclient</code></p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">$ pip install mysqlclient</span><br></pre></td></tr></table></figure>
<p>你能下载成功，但可能安装失败。提示类似 <strong><code>“_mysql.c(29): fatal error C1083: 无法打开包括文件: “mysql.h”: No such file
or directory”</code></strong> 的信息。</p>
<blockquote>
<p>总而言之，这是 window 开发者需要背负的穷罪。</p>
</blockquote>
<p>解决方案都在这里：<a href="https://www.lfd.uci.edu/~gohlke/pythonlibs/#mysqlclient" target="_blank" rel="noopener">https://www.lfd.uci.edu/~gohlke/pythonlibs/#mysqlclient</a></p>
<p>我们的目标是手动选择一个适合的 mysqlclient.whl ，然后编译。</p>
<hr>
<h4 id="1、先安装-wheel，才可以编译-whl-文件"><a href="#1、先安装-wheel，才可以编译-whl-文件" class="headerlink" title="1、先安装 wheel，才可以编译 *.whl 文件"></a>1、先安装 wheel，才可以编译 *.whl 文件</h4><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">$ pip install wheel</span><br></pre></td></tr></table></figure>
<h4 id="2、安装Microsoft-Visual-C"><a href="#2、安装Microsoft-Visual-C" class="headerlink" title="2、安装Microsoft Visual C++"></a>2、安装Microsoft Visual C++</h4><p>Python 2.7：Microsoft Visual C++ 2008 (<a href="https://www.microsoft.com/en-us/download/details.aspx?id=15336" target="_blank" rel="noopener">x64</a>, <a href="https://www.microsoft.com/en-us/download/details.aspx?id=29" target="_blank" rel="noopener">x86</a>, and <a href="https://www.microsoft.com/en-us/download/details.aspx?id=26368" target="_blank" rel="noopener">SP1</a>) </p>
<p>Python 3.x：Visual C++ 2017 (<a href="https://support.microsoft.com/en-us/help/2977003/the-latest-supported-visual-c-downloads" target="_blank" rel="noopener">x64 or x86</a>) </p>
<h4 id="3、查看-pip-支持的版本"><a href="#3、查看-pip-支持的版本" class="headerlink" title="3、查看 pip 支持的版本"></a>3、查看 pip 支持的版本</h4><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"># AMD64</span><br><span class="line">import pip._internal</span><br><span class="line">print(pip._internal.pep425tags.get_supported())</span><br><span class="line"></span><br><span class="line"># WIN32</span><br><span class="line">import pip</span><br><span class="line">print(pip.pep425tags.get_supported())</span><br></pre></td></tr></table></figure>
<p>环境不同，输出不同，我的输入如下：</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">[('cp37', 'cp37m', 'win32'), ('cp37', 'none', 'win32'), ('py3', 'none', 'win32'), ('cp37', 'none', 'any'), ('cp3', 'none', 'any'), ('py37', 'none', 'any'), ('py3', 'none', 'any'), ('py36', 'none', 'any'), ('py35', 'none', 'any'), ('py34', 'none', 'any'), ('py33', 'none', 'any'), ('py32', 'none', 'any'), ('py31', 'none', 'any'), ('py30', 'none', 'any')]</span><br></pre></td></tr></table></figure>
<p>根据我的支持表，我找到了文件： <a href="https://download.lfd.uci.edu/pythonlibs/u2hcgva4/mysqlclient-1.4.2-cp37-cp37m-win32.whl" target="_blank" rel="noopener">mysqlclient-1.4.2-cp37-cp37m-win32.whl</a></p>
<p>你可以在这里查找：<a href="https://www.lfd.uci.edu/~gohlke/pythonlibs/#mysqlclient" target="_blank" rel="noopener">https://www.lfd.uci.edu/~gohlke/pythonlibs/#mysqlclient</a></p>
<p>也可以在pip仓库查找各种历史版本：<a href="https://pypi.org/project/mysqlclient/#files" target="_blank" rel="noopener">https://pypi.org/project/mysqlclient/#files</a></p>
<p>下载之后，进行安装</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">$ pip install mysqlclient-1.4.2-cp37-cp37m-win32.whl</span><br></pre></td></tr></table></figure>
<p>成功了你会看到如下输出：<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">Processing c:\users\lee\downloads\mysqlclient-1.4.2-cp37-cp37m-win32.whl</span><br><span class="line">Installing collected packages: mysqlclient</span><br><span class="line">Successfully installed mysqlclient-1.4.2</span><br></pre></td></tr></table></figure></p>
<p>如果是不正确的版本，你会出现如下报错：</p>
<p><strong><code>mysqlclient-1.3.11-cp36-cp36m-win32.whl is not a supported wheel on this platform.</code></strong></p>
<p>不需要担心，慢慢找到匹配 pip 的即可。</p>
<hr>
<p>一切尘埃落定之后，重新执行一下最初的 migratemigrate 命令。</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">$ python manage.py migrate</span><br></pre></td></tr></table></figure>
<p>如果你的 mysql 版本是 5.5（笔者用 phpstudy 最新版也只有5.5）。还会出现一个 SQL 错误的信息:</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">django.db.migrations.exceptions.MigrationSchemaMissing: Unable to create the django_migrations table ((1064, "You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax</span><br><span class="line">to use near '(6) NOT NULL)' at line 1"))</span><br></pre></td></tr></table></figure>
<p>MySQL5.5并不支持Django2.1生成的这种SQL语句。我选择安装了 mysql lastest 版本。既 (mysql8.0.15)[<a href="https://dev.mysql.com/downloads/mysql/]" target="_blank" rel="noopener">https://dev.mysql.com/downloads/mysql/]</a></p>
<p>如果不会安装，请参考我的另一篇建议笔记：<a href="https://www.cnblogs.com/CyLee/p/7421949.html" target="_blank" rel="noopener">mysql 编译安装 window篇</a></p>
<p>或者参考网站 mysql 安装教程。总之要确保运行中的 mysql 服务版本是 5.5 以上。</p>
<p>在确保你的 mysql 是最新且能访问之后。重新执行一下该命令。</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">python manage.py migrate</span><br></pre></td></tr></table></figure>
<p>如果成功会看到如下信息：</p>
<p><img src="http://wx4.sinaimg.cn/large/006ar8zgly1g22e0ocrewj30k00clmzu.jpg" alt=""></p>
<p>再看看你的数据库，django 生成了不少实用的表。</p>
<p><img src="http://wx2.sinaimg.cn/large/006ar8zgly1g22e019t2kj30n607ndhp.jpg" alt=""></p>
<p>（完）</p>
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<a class="article-category-link" href="/categories/npm/">npm</a>
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<a class="article-title" href="/2019/03/20/npmpublish/">npm 发布包和删除包（2019最新攻略）</a>
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<p>📖 阅读本文大概需要 6 分钟。</p>
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<h3 id="操作概览"><a href="#操作概览" class="headerlink" title="操作概览"></a>操作概览</h3><ol>
<li>验证你的包名是否重复。</li>
<li>npm 官网注册账号（略）。</li>
<li>npm init 初始化你的包。</li>
<li>发布 npm publish。</li>
<li>如何发布新版本？</li>
<li>如何删除你的发布包？</li>
<li>什么是 2FA？什么是 Authenticator App？什么是 One-time Password？</li>
<li>（后记）补充说明</li>
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<article id="post-flutterdebuger" class="article is-index article-post article-type-post" itemscope="" itemprop="blogPost">
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<a href="/2019/03/12/flutterdebuger/" class="article-date">
<time datetime="2019-03-12T01:52:17.000Z" itemprop="datePublished">2019-03-12</time>
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<a class="article-category-link" href="/categories/flutter/">flutter</a>
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<h1 itemprop="name">
<a class="article-title" href="/2019/03/12/flutterdebuger/">flutter Android 调试指南</a>
</h1>
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<hr>
<p>操作预览：</p>
<ol>
<li>准备一条数据线，并连接电脑和手；</li>
<li>使用 <code>flutter devices</code> 查看设备能否找到；</li>
<li>在 <code>Android studio</code> 中选择你的真机，然后点击 <code>[debug]</code>；</li>
<li>真机自动安装App。</li>
</ol>
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<article id="post-androidssr" class="article is-index article-post article-type-post" itemscope="" itemprop="blogPost">
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<a href="/2019/03/10/androidssr/" class="article-date">
<time datetime="2019-03-10T05:22:26.000Z" itemprop="datePublished">2019-03-10</time>
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<a class="article-category-link" href="/categories/ssr/">ssr</a>
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<a class="article-title" href="/2019/03/10/androidssr/">androidssr</a>
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<p>看上去比windows客户端多了很多选项，但实际上只需要设置这五个：</p>
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<article id="post-requestjs" class="article is-index article-post article-type-post" itemscope="" itemprop="blogPost">
<div class="article-meta">
<a href="/2019/03/06/requestjs/" class="article-date">
<time datetime="2019-03-06T02:54:53.000Z" itemprop="datePublished">2019-03-06</time>
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<a class="article-category-link" href="/categories/JavaScript/">JavaScript</a>
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<h1 itemprop="name">
<a class="article-title" href="/2019/03/06/requestjs/">请求缓存策略</a>
</h1>
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<hr>
<p>该代码摘抄自 <a href="https://github.com/ant-design/ant-design-pro/blob/master/src/utils/request.js#L66" target="_blank" rel="noopener">ant-design-pro</a> </p>
<p><a href="https://github.com/ant-design/ant-design-pro/blob/master/src/utils/request.js#L66" target="_blank" rel="noopener">https://github.com/ant-design/ant-design-pro/blob/master/src/utils/request.js#L66</a></p>
<p>只要不是实时数据的接口，基本上都可以充分利用请求缓存的特性，节约客户端网络资源的浪费，也减少服务器的请求压力。</p>
<p>特别是我的项目中的数据，最短的迭代周期也是“每日一更”。所以缓存特性可以放心大胆使用。但为了保险，缓存生命周期还是设置短一点。比如1分钟。</p>
<p>原理大致是这样的：</p>
<ol>
<li>每次请求都先判断是否存在缓存，如果没有则存起来，如果有则需要判断缓存是否过期，如果过期则还是要请求，否则才返回缓存；</li>
<li>每次存之前，判断缓存是否满了？（sessionStoreage的容量大概5M），如果满了则需要清空再存入。值得注意的是，如果数据体积超过5M（几十万数据），那你清空存入还是会报错。所以我们存入之前要判断数据体积是否大于5M，如果是则不加入缓存；</li>
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<article id="post-bibaoIIFE" class="article is-index article-post article-type-post" itemscope="" itemprop="blogPost">
<div class="article-meta">
<a href="/2019/03/05/bibaoIIFE/" class="article-date">
<time datetime="2019-03-05T14:27:09.000Z" itemprop="datePublished">2019-03-05</time>
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<a class="article-category-link" href="/categories/JavaScript/">JavaScript</a>
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<h1 itemprop="name">
<a class="article-title" href="/2019/03/05/bibaoIIFE/">善用 JavaScript 特性：闭包与IIFE</a>
</h1>
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<div class="article-entry" itemprop="articleBody">
<hr>
<p>一、使用 <code>IIFE</code> 优雅的解决 <code>setInterval</code> 首次不执行的尴尬。<br><figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 你的函数</span></span><br><span class="line"><span class="keyword">const</span> f = <span class="function"><span class="params">()</span> =></span> { ... }</span><br><span class="line"></span><br><span class="line"><span class="comment">// 立即执行并且轮询</span></span><br><span class="line"><span class="keyword">const</span> timer = (<span class="function"><span class="keyword">function</span>(<span class="params">fn, t</span>) </span>{</span><br><span class="line"> <span class="comment">// 为了解决 setInterval 首次不执行的尴尬</span></span><br><span class="line"> fn && fn()</span><br><span class="line"> <span class="comment">// 返回计时器timer</span></span><br><span class="line"> <span class="keyword">return</span> setInterval(fn, t)</span><br><span class="line">})(f, <span class="number">1500</span>)</span><br></pre></td></tr></table></figure></p>
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<article id="post-norepeatxhr" class="article is-index article-post article-type-post" itemscope="" itemprop="blogPost">
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<a href="/2019/03/05/norepeatxhr/" class="article-date">
<time datetime="2019-03-05T02:59:17.000Z" itemprop="datePublished">2019-03-05</time>
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<a class="article-category-link" href="/categories/xhr/">xhr</a>
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<h1 itemprop="name">
<a class="article-title" href="/2019/03/05/norepeatxhr/">更优雅的防止请求(XHR)重复 —— 请求队列</a>
</h1>
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<p><hr><br>问题：重复请求的问题在开发中很常见，浪费网络资源倒是其次，最怕的是前一次的点击逻辑，把后面的逻辑覆盖了。</p>
<blockquote>
<p>譬如，你在列表中点击了“吴彦祖”，然后再快速点击了“吴孟达”。假设“吴彦祖”的数据请求需要3秒，而“吴孟达”只需要2秒，那么结果就是，页面会先渲染出“吴彦祖”，而后又马上“吴孟达”的数据覆盖。</p>
<p><strong>用户本来是想查看“吴彦祖”的照片，而界面展示的却是“吴孟达”……</strong></p>
</blockquote>
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<article id="post-Dartpub" class="article is-index article-post article-type-post" itemscope="" itemprop="blogPost">
<div class="article-meta">
<a href="/2019/02/21/Dartpub/" class="article-date">
<time datetime="2019-02-21T03:22:43.000Z" itemprop="datePublished">2019-02-21</time>
</a>
<div class="article-category">
<a class="article-category-link" href="/categories/Dart/">Dart</a>►<a class="article-category-link" href="/categories/Dart/Flutter/">Flutter</a>
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<h1 itemprop="name">
<a class="article-title" href="/2019/02/21/Dartpub/">Dart（Flutter） pub 包管理</a>
</h1>
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<hr>
<p>Pub（<a href="https://pub.dartlang.org/" target="_blank" rel="noopener">https://pub.dartlang.org/</a> ）是Google官方的Dart Packages仓库，类似于node中的npm仓库，android中的jcenter，我们可以在上面查找我们需要的包和插件，也可以向pub发布我们的包和插件。我们将在后面的章节中介绍如何向pub发布我们的包和插件。</p>
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<article id="post-DartWeb" class="article is-index article-post article-type-post" itemscope="" itemprop="blogPost">
<div class="article-meta">
<a href="/2019/02/20/DartWeb/" class="article-date">
<time datetime="2019-02-20T09:41:10.000Z" itemprop="datePublished">2019-02-20</time>
</a>
<div class="article-category">
<a class="article-category-link" href="/categories/Dart/">Dart</a>
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<header class="article-header">
<h1 itemprop="name">
<a class="article-title" href="/2019/02/20/DartWeb/">Dart for the web 一小时入门</a>
</h1>
</header>
<div class="article-entry" itemprop="articleBody">
<hr>
<p>官方网站：<a href="https://webdev.dartlang.org/guides/get-started" target="_blank" rel="noopener">https://webdev.dartlang.org/guides/get-started</a></p>
<h4 id="1、Dart-window-安装"><a href="#1、Dart-window-安装" class="headerlink" title="1、Dart-window 安装"></a>1、Dart-window 安装</h4><p><a href="http://www.gekorm.com/dart-windows/" target="_blank" rel="noopener">http://www.gekorm.com/dart-windows/</a></p>
<h4 id="2、安装开发工具-webstorm"><a href="#2、安装开发工具-webstorm" class="headerlink" title="2、安装开发工具 webstorm"></a>2、安装开发工具 webstorm</h4><p><a href="https://webdev.dartlang.org/tools/webstorm" target="_blank" rel="noopener">https://webdev.dartlang.org/tools/webstorm</a></p>
<h4 id="3、安装使用-pub-安装两个必备插件：activate，webdev"><a href="#3、安装使用-pub-安装两个必备插件：activate，webdev" class="headerlink" title="3、安装使用 pub 安装两个必备插件：activate，webdev"></a>3、安装使用 pub 安装两个必备插件：activate，webdev</h4><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">> pub global activate webdev</span><br><span class="line">> pub global activate stagehand</span><br></pre></td></tr></table></figure>
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<article id="post-在Windows上搭建Flutter开发环境" class="article is-index article-post article-type-post" itemscope="" itemprop="blogPost">
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<a href="/2019/02/20/在Windows上搭建Flutter开发环境/" class="article-date">
<time datetime="2019-02-20T08:08:58.000Z" itemprop="datePublished">2019-02-20</time>
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<a class="article-category-link" href="/categories/flutter/">flutter</a>
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<h1 itemprop="name">
<a class="article-title" href="/2019/02/20/在Windows上搭建Flutter开发环境/">在 Windows 上搭建 Flutter 开发环境</a>
</h1>
</header>
<div class="article-entry" itemprop="articleBody">
<p><hr><br>1、获取Flutter SDK：<a href="https://flutter.io/sdk-archive/#windows" target="_blank" rel="noopener">https://flutter.io/sdk-archive/#windows</a></p>
<p>2、解压 <strong>flutter_windows_v1.0.0-stable.zip</strong>，并将 flutter/bin 加入到环境变量</p>
<p>3、安装Android Studio ：<a href="https://developer.android.google.cn" target="_blank" rel="noopener">https://developer.android.google.cn</a></p>
<p>4、在 Android Studio 的 <strong>Browse repositories</strong> 安装 <strong>Flutter</strong> 和 <strong>Dart</strong> 插件</p>
<ul>
<li>Flutter插件： 支持Flutter开发工作流 (运行、调试、热重载等)。</li>
<li>Dart插件： 提供代码分析 (输入代码时进行验证、代码补全等)。</li></ul>
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