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<!DOCTYPE html>
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Dart 2.4.0 版本启动！ 更多信息参见
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<li class="toc-entry nav-item toc-h3"><a class="nav-link" href="#section-1">升级</a></li>
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<h1>获取 Dart SDK</h1>
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<li class="toc-entry toc-h2"><a href="#install">安装 Dart SDK</a>
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<li class="toc-entry toc-h3"><a href="#section-1">升级</a></li>
<li class="toc-entry toc-h3"><a href="#section-2">切换版本</a></li>
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<p>Dart SDK 包含开发 Web ，命令行，服务端应用所需要的库和命令行工具，
如果仅需要开发移动端应用，只要<a href="https://flutter.dev/docs/get-started/install">安装 Flutter</a> 即可，不需要 Dart SDK 。</p>
<p>要了解 Dart 开发中的其他可用工具，请参阅 <a href="/tools">Dart 工具</a> 。
要了解 SDK 中的内容，请参阅<a href="/tools/sdk">Dart SDK 概述</a>。</p>
<aside class="alert alert-info">
<p><strong>Note:</strong>
注意：本网站的文档和示例基于
<strong>Dart SDK</strong> <a href="https://api.dart.dev/stable/2.4/index.html" class="no-automatic-external">2.4</a>
版本。</p>
</aside>
<h2 id="install">
<a id="install" class="anchor" href="#install" aria-hidden="true"><span class="octicon octicon-link"></span></a>安装 Dart SDK</h2>
<p>如下介绍，可以使用包管理器轻松的安装更新 Dart SDK。也可以，从源代码<a href="https://github.com/dart-lang/sdk/wiki/Building">构建 SDK </a>或者<a href="/tools/sdk/archive">下载 SDK zip 包文件</a>。</p>
<aside class="alert alert-warning">
<p>Dart 工具可能会向 Google 发送使用指标和崩溃报告。
下载 Dart SDK，即表示您已同意
<a href="https://policies.google.com/terms">Google 服务条款</a>。
注意：<a href="https://policies.google.com/privacy">Google 隐私权政策</a>
介绍了在此服务中的数据被如何处理。</p>
</aside>
<ul class="tabs__top-bar">
<li class="tab-link current" data-tab="tab-sdk-install-windows">Windows</li>
<li class="tab-link" data-tab="tab-sdk-install-linux">Linux</li>
<li class="tab-link" data-tab="tab-sdk-install-mac">Mac</li>
</ul>
<div id="tab-sdk-install-windows" class="tabs__content current">
<p>选择以下一种方式安装：</p>
<h4 id="chocolatey-">使用 Chocolatey 安装</h4>
<p>使用 <a href="https://chocolatey.org">Chocolatey</a> 执行以下指令安装<strong>稳定版</strong> Dart SDK：</p>
<div class="language-terminal highlighter-rouge">
<div class="highlight"><pre class="highlight"><code><span class="gp">C:\></span> choco <span class="nb">install </span>dart-sdk
</code></pre></div> </div>
<p>执行以下指令安装<strong>开发板</strong>：</p>
<div class="language-terminal highlighter-rouge">
<div class="highlight"><pre class="highlight"><code><span class="gp">C:\></span> choco <span class="nb">install </span>dart-sdk <span class="nt">--pre</span>
</code></pre></div> </div>
<p>执行以下指令<strong>升级</strong> Dart SDK （升级开发板添加 <code class="highlighter-rouge">--pre</code> 参数）：</p>
<div class="language-terminal highlighter-rouge">
<div class="highlight"><pre class="highlight"><code><span class="gp">C:\></span> choco upgrade dart-sdk
</code></pre></div> </div>
<h4 id="section">使用设置向导安装</h4>
<p>另外，你可以使用社区提供的
<a href="http://www.gekorm.com/dart-windows" target="_blank"> Windows 安装包</a>。
通过设置向导安装 <strong>稳定版</strong> 或者 <strong>开发版</strong> 的 Dart SDK 。</p>
<p><img src="/assets/shared/dart/installer-screenshot-no-272278ce31f0cd3b44fbd998c55b83c945cd6c1f774de0258bf81a6fa7dcc563.png" alt="Windows Dart Setup Wizard" class="text-center" width="250"></p>
</div>
<div id="tab-sdk-install-linux" class="tabs__content">
<p>如果是在 Debian/Ubuntu 系统的 AMD64 (64-bit Intel) 机器上，可选择以下一种方式安装，
两个方式都可以在发布新版本时自动更新 SDK 。</p>
<h4 id="apt-get-">使用 apt-get 安装</h4>
<p>执行以下<strong>一次性</strong>设置：</p>
<div class="language-terminal highlighter-rouge">
<div class="highlight"><pre class="highlight"><code><span class="gp">$</span> <span class="nb">sudo </span>apt-get update
<span class="gp">$</span> <span class="nb">sudo </span>apt-get <span class="nb">install </span>apt-transport-https
<span class="gp">$</span> <span class="nb">sudo </span>sh <span class="nt">-c</span> <span class="s1">'curl https://dl-ssl.google.com/linux/linux_signing_key.pub | apt-key add -'</span>
<span class="gp">$</span> <span class="nb">sudo </span>sh <span class="nt">-c</span> <span class="s1">'curl https://storage.googleapis.com/download.dartlang.org/linux/debian/dart_stable.list > /etc/apt/sources.list.d/dart_stable.list'</span>
</code></pre></div> </div>
<p>然后安装
<strong>稳定版</strong>
Dart SDK ：</p>
<div class="language-terminal highlighter-rouge">
<div class="highlight"><pre class="highlight"><code><span class="gp">$</span> <span class="nb">sudo </span>apt-get update
<span class="gp">$</span> <span class="nb">sudo </span>apt-get <span class="nb">install </span>dart
</code></pre></div> </div>
<p>或者，安装
<strong>开发板</strong>
Dart SDK ，
执行一次性设置命令：</p>
<div class="language-terminal highlighter-rouge">
<div class="highlight"><pre class="highlight"><code><span class="gp">$</span> <span class="nb">sudo </span>sh <span class="nt">-c</span> <span class="s1">'curl https://storage.googleapis.com/download.dartlang.org/linux/debian/dart_unstable.list > /etc/apt/sources.list.d/dart_unstable.list'</span>
<span class="gp">$</span> <span class="nb">sudo </span>apt-get update
<span class="gp">$</span> <span class="nb">sudo </span>apt-get <span class="nb">install </span>dart
</code></pre></div> </div>
<h4 id="debian-">安装 Debian 包</h4>
<p>以.deb包格式</p>
<p>另外，可以下载 Debian <code class="highlighter-rouge">.deb</code> 格式的 Dart SDK 安装包。</p>
<ul class="downloads">
<li><a href="#" class="download-link" id="debian-link-stable" data-bits="64" data-os="debian" data-tool="sdk">Stable channel</a></li>
<li><a href="#" class="download-link" id="debian-link-dev" data-bits="64" data-os="debian" data-tool="sdk">Dev channel</a></li>
</ul>
<h4 id="dart-path">修改访问 Dart 库的环境变量（PATH）</h4>
<p>SDK 安装完成后，添加 SDK 的 bin 目录到环境变量中。例如：
使用以下命令更改当前终端会话中的环境变量：</p>
<div class="language-terminal highlighter-rouge">
<div class="highlight"><pre class="highlight"><code><span class="gp">$</span> <span class="nb">export </span><span class="nv">PATH</span><span class="o">=</span><span class="s2">"</span><span class="nv">$PATH</span><span class="s2">:/usr/lib/dart/bin"</span>
</code></pre></div> </div>
<p>要更改新建终端会话的环境变量，使用命令：</p>
<div class="language-terminal highlighter-rouge">
<div class="highlight"><pre class="highlight"><code><span class="gp">$</span> <span class="nb">echo</span> <span class="s1">'export PATH="$PATH:/usr/lib/dart/bin"'</span> <span class="o">>></span> ~/.profile
</code></pre></div> </div>
</div>
<div id="tab-sdk-install-mac" class="tabs__content">
<p><a href="http://brew.sh/">安装 homebrew</a>，然后执行以下命令：</p>
<div class="language-terminal highlighter-rouge">
<div class="highlight"><pre class="highlight"><code><span class="gp">$</span> brew tap dart-lang/dart
<span class="gp">$</span> brew <span class="nb">install </span>dart
</code></pre></div> </div>
<p>添加 <code class="highlighter-rouge">--devel</code> 参数安装<strong>稳定版</strong>：</p>
<div class="language-terminal highlighter-rouge">
<div class="highlight"><pre class="highlight"><code><span class="gp">$</span> brew <span class="nb">install </span>dart <span class="nt">--devel</span>
</code></pre></div> </div>
<h3 id="section-1">
<a id="section-1" class="anchor" href="#section-1" aria-hidden="true"><span class="octicon octicon-link"></span></a>升级</h3>
<p>升级 Dart 到一个新的可用版本：</p>
<div class="language-terminal highlighter-rouge">
<div class="highlight"><pre class="highlight"><code><span class="gp">$</span> brew upgrade dart
</code></pre></div> </div>
<p>如果当前有效版本为开发版，想要安装稳定版，执行：</p>
<div class="language-terminal highlighter-rouge">
<div class="highlight"><pre class="highlight"><code><span class="gp">$</span> brew <span class="nb">unlink </span>dart
<span class="gp">$</span> brew <span class="nb">install </span>dart
</code></pre></div> </div>
<p>如果当前有效版本为稳定版，要升级到开发版，执行：</p>
<div class="language-terminal highlighter-rouge">
<div class="highlight"><pre class="highlight"><code><span class="gp">$</span> brew upgrade dart <span class="nt">--devel</span> <span class="nt">--force</span>
</code></pre></div> </div>
<h3 id="section-2">
<a id="section-2" class="anchor" href="#section-2" aria-hidden="true"><span class="octicon octicon-link"></span></a>切换版本</h3>
<p>切换本地已安装 Dart 版本，执行 <code class="highlighter-rouge">brew switch dart <version></code> 。例如：</p>
<div class="language-terminal highlighter-rouge">
<div class="highlight"><pre class="highlight"><code><span class="gp">$</span> brew switch dart 1.24.3
<span class="gp">$</span> brew switch dart 2.1.0
</code></pre></div> </div>
<p>如果无法确定本地已安装了哪些版本，可执行：</p>
<div class="language-terminal highlighter-rouge">
<div class="highlight"><pre class="highlight"><code><span class="gp">$</span> brew info dart
</code></pre></div> </div>
<p>该指令在顶部会打印最新的稳定版和开发版，随后会列出本地已安装的版本。</p>
</div>
<h2 id="关于发布渠道和版本号">
<a id="关于发布渠道和版本号" class="anchor" href="#%E5%85%B3%E4%BA%8E%E5%8F%91%E5%B8%83%E6%B8%A0%E9%81%93%E5%92%8C%E7%89%88%E6%9C%AC%E5%8F%B7" aria-hidden="true"><span class="octicon octicon-link"></span></a>关于发布渠道和版本号</h2>
<p>Dart SDK 有两个发布渠道：</p>
<ul>
<li>
<strong>稳定版</strong> 渠道： <strong>稳定发行版</strong>，每六周更新一次；
当前版本 <code class="editor-build-rev-stable highlighter-rouge">[calculating]</code>.</li>
<li>
<strong>开发版</strong> 渠道： <strong>预览发行版</strong>，通常每周更新一次；
当前版本 <code class="editor-build-rev-dev highlighter-rouge">[calculating]</code>.</li>
</ul>
<aside class="alert alert-warning">
<p><strong>警告：</strong>
为了让开发者能够及早了解新功能和修复程序，发行的开发版并未经过像稳定版那样的严格测试。</p>
</aside>
<p><strong>稳定版</strong> 通道发行的 Dart SDK 版本具有 <code class="highlighter-rouge">1.24.3</code> 或 <code class="highlighter-rouge">2.1.0</code> 的版本号描述。
版本号是由点分隔的整数组成，不会包含连接符或字符。</p>
<p><strong>开发版</strong> 通道发行的 Dart SDK 版本（预览发行版）版本号中包含以连接符开始的其他字符。
例如：Dart 2 预览发行版的版本号 <code class="highlighter-rouge">2.0.0-dev.69.5</code> 是以 <code class="highlighter-rouge">2.0.0-dev</code> 开始，并附加数字版本。</p>
<p>更多内容, 参见<a href="/dart-2"> Dart 2 章节</a>。</p>
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