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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="Content-Language" content="en_US" />
<meta http-equiv="x-ua-compatible" content="ie=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta name="description" content="dartlang's 404 page.">
<title>404: Page not found | Dart</title>
<!-- Favicon / Touch Icons -->
<link rel="icon" sizes="64x64" href="/assets/shared/dart/icon/64.png">
<link href="/assets/touch-icon-iphone-a46c306c4fbfae0b28d63f512b01d7cb2ccf1e4ca9d7f3aab15ba1170beed4a0.png" rel="apple-touch-icon">
<link href="/assets/touch-icon-ipad-d0181720760b3912858b6d40da1d5586b1e92c7c8656a485ea41005674401e6b.png" rel="apple-touch-icon" sizes="76x76">
<link href="/assets/touch-icon-iphone-retina-3d9821a631425376ac6203dea3c23c1940ab7b5c506a25406662fab76cee2e0b.png" rel="apple-touch-icon" sizes="120x120">
<link href="/assets/touch-icon-ipad-retina-b9715401952522f1daee2b4a4064a1bbfb5ffab78d0a47a7226dc87444d51c32.png" rel="apple-touch-icon" sizes="152x152">
<!-- Twitter Card -->
<meta name="twitter:card" content="summary" />
<meta name="twitter:site" content="@dart_lang" />
<meta name="twitter:title" content="404: Page not found" />
<meta name="twitter:description" content="dartlang's 404 page." />
<!-- Open Graph -->
<meta property="og:title" content="404: Page not found" />
<meta property="og:description" content="dartlang's 404 page." />
<meta property="og:url" content="https://www.dartlang.org/404" />
<meta property="og:image" content="https://www.dartlang.org/assets/shared/dart-logo-for-shares.png?2" />
<link href="https://fonts.googleapis.com/css?family=Google+Sans:300,400,500|Google+Sans+Display:400|Roboto:300,400,500|Roboto+Mono:300,400,700|Material+Icons" rel="stylesheet">
<link rel="stylesheet" type="text/css" integrity="sha256-S0f9nOqFuIcXJSRb1Y4WwIH+QKL9f54WrcUkklWPM4k=" crossorigin="anonymous" href="/assets/main-4b47fd9cea85b8871725245bd58e16c081fe40a2fd7f9e16adc52492558f3389.css">
<script src="/assets/main-f7f2f2125f3c379daf0f5ca0ecf142cd2e10b030af396a510324fddb1682c5e2.js" integrity="sha256-9/LyEl88N52vD1yg7PFCzS4QsDCvOWpRAyT92xaCxeI=" crossorigin="anonymous" type="text/javascript"></script>
<script>
(function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
(i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
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})(window,document,'script','//www.google-analytics.com/analytics.js','ga');
ga('create', 'UA-26406144-4', 'auto');
ga('send', 'pageview');
</script>
</head>
<body class="error hide_toc">
<header id="page-header" class="site-header">
<nav id="mainnav" class="site-header">
<div id="menu-toggle"><i class="icon icon-menu"></i></div>
<a href="/" class="brand" title="Dart">
<img src="/assets/shared/dart/logo+text/horizontal/white-e71fb382ad5229792cc704b3ee7a88f8013e986d6e34f0956d89c453b454d0a5.svg" alt="Dart">
</a>
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<li class="mainnav__get-started">
<a href="/guides" class="nav-link"><span>文档</span></a>
</li>
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</li>
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<a href="/community" class="nav-link">社区</a>
</li>
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<a href="https://dartpad.cn/" target="_blank" class="nav-link no-automatic-external">体验 Dart</a>
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<a href="/get-dart" class="nav-link">安装 Dart</a>
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<a href="/about_zh_CN" class="nav-link">关于</a>
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<form action="/search" class="site-header__search form-inline" id="cse-search-box">
<input type="hidden" name="cx" value="011220921317074318178:_yy-tmb5t_i">
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<div class="banner">
<p class="banner__text">
Dart 2.4.0 版本启动！ 更多信息参见
<a class="external" href="https://github.com/dart-lang/sdk/blob/master/CHANGELOG.md#240---2019-06-27">更新日志</a>。
</p>
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</form>
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<a class="nav-link" href="/articles/libraries/dart-io">Intro to dart:io</a>
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<a class="nav-link" href="/guides/libraries/create-library-packages">创建包</a>
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>引用包
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<a class="nav-link" href="/tools/pub/dependencies">依赖</a>
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<a class="nav-link" href="/tools/pub/glossary">术语</a>
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<a class="nav-link" href="/tools/pub/package-layout">包的设计约定</a>
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<a class="nav-link" href="/tools/pub/pubspec">Pubspec 文件</a>
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<a class="nav-link" href="/tools/pub/troubleshoot">Pub 问题分析与解决</a>
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</li></ul>
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aria-expanded="false" aria-controls="sidenav-5"
>开发</a>
<ul class="nav flex-column flex-nowrap collapse " id="sidenav-5">
<li class="nav-item">
<a class="nav-link" href="/tutorials/language/futures">Futures & Async-Await</a>
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<a class="nav-link" href="/guides/json">使用 JSON</a>
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<a class="nav-link" href="/tutorials/language/streams">Stream</a>
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<a class="nav-link" href="/mobile">移动应用</a>
</li><li class="nav-item">
<a class="nav-link collapsable collapsed"
data-toggle="collapse" data-target="#sidenav-5-5"
href="#sidenav-5-5" role="button"
aria-expanded="false" aria-controls="sidenav-5-5"
>命令行应用 & 服务应用
</a>
<ul class="nav flex-column flex-nowrap collapse " id="sidenav-5-5">
<li class="nav-item">
<a class="nav-link" href="/server">综述</a>
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<a class="nav-link" href="/tutorials/server/get-started">入门</a>
</li><li class="nav-item">
<a class="nav-link" href="/tutorials/server/cmdline">编写命令行应用</a>
</li><li class="nav-item">
<a class="nav-link" href="/tutorials/server/httpserver">编写 HTTP 客户端和服务端应用</a>
</li><li class="nav-item">
<a class="nav-link" href="/server/c-interop">C & C++ 交互</a>
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<a class="nav-link" href="/server/libraries">库和包</a>
</li></ul>
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data-toggle="collapse" data-target="#sidenav-5-6"
href="#sidenav-5-6" role="button"
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>Web 应用
</a>
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<li class="nav-item">
<a class="nav-link" href="/web">综述</a>
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<a class="nav-link" href="/tutorials/web/fetch-data">动态获取数据</a>
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>底层 Web 编程
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<a class="nav-link" href="/tutorials/web/low-level-html/connect-dart-html">Dart 和 HTML 关联</a>
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<a class="nav-link" href="/tutorials/web/low-level-html/add-elements">在 DOM 中增加 Element</a>
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>工具 & 技巧</a>
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>编辑 & 调试
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>命令行工具
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data-toggle="collapse" data-target="#sidenav-6-3-1"
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aria-expanded="true" aria-controls="sidenav-6-3-1"
>Dart SDK
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<a class="nav-link" href="/tools/sdk">综述</a>
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<a class="nav-link" href="/tools/dart2aot">dart2aot & dartaotruntime</a>
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