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class=\"payload-richtext\">\u003Cp>"渐进式网络应用程序（Progressive Web App，简称 PWA）" 这一术语由谷歌工程师亚历克斯・罗素（Alex Russell）和弗朗西斯・贝里曼（Frances Berriman）在 2015 年创造。这个概念源于这样一种观察：尽管网络上有大量资源，但大多数用户在移动设备上的时间都花在了应用程序中。PWA 的设想是提供两全其美的方案：既有网络的广泛覆盖，又有原生应用程序的迷人体验。\u003C/p>\u003Cp>在本文中，你将了解 PWA 的起源、架构以及对现代网页开发的影响。但在此之前，让我们先来谈谈这个。\u003C/p>\u003Ch2>什么是PWA（渐进式网络应用程序）？\u003C/h2>\u003Cp>渐进式网络应用程序是一种结合了特定标准和技术的网站，能提供类似于原生应用程序的用户体验。它们利用现代网络功能，直接在网络浏览器中提供类似应用程序的体验，用户无需访问应用商店或进行冗长的安装过程。\u003C/p>\u003Ch2>为什么 PWA 在现代网页开发中很重要？\u003C/h2>\u003Cp>PWA 在现代网页开发中变得越来越重要，原因有以下几点。它们提供无缝的用户体验，即使在网络连接不佳的地区或硬件能力有限的设备上也是如此。这种包容性将网络服务的覆盖范围扩大到更广泛的受众。此外，PWA 可以直接在服务器上进行更新，无需像传统应用程序那样让用户下载更新。\u003C/p>\u003Cp>随着我们的继续探讨，我们将揭示 PWA 的技术基础、为用户和开发者带来的好处以及开发过程中面临的挑战。\u003C/p>\u003Cp>核心概念\u003C/p>\u003Cp>渐进式网络应用程序（PWA）的核心概念是其功能和形式的基础。这些概念是使 PWA 能够提供可与原生应用程序相媲美的用户体验的基石。让我们深入研究这些关键组成部分。\u003C/p>\u003Cp>理解应用外壳模型\u003C/p>\u003Cp>应用外壳模型是支撑 PWA 结构的设计概念。它指的是为用户界面提供动力的最小 HTML、CSS 和 JavaScript 集合。其理念是在用户首次访问时将应用外壳缓存到用户设备上，以便在后续加载时实现即时、可靠的性能，就像原生应用程序一样。这个外壳充当随每个页面视图而变化的动态内容的容器。\u003C/p>\u003Ch2>服务工作者\u003C/h2>\u003Cp>服务工作者是 PWA 强大功能的核心。它们是可脚本化的网络代理，位于网络应用程序、浏览器和网络（如果可用）之间。服务工作者使 PWA 能够控制网络请求、缓存资源，并利用它们创建离线体验。它们还允许进行后台同步和推送通知，增强了应用程序即使在用户未积极使用时也能提供内容并吸引用户的能力。\u003C/p>\u003Ch2>清单文件在 PWA 中的作用\u003C/h2>\u003Cp>网络应用清单是一个 JSON 文件，允许开发人员控制 PWA 在用户通常看到应用程序的地方（例如，移动主屏幕）对用户的显示方式、指定用户可以启动的内容以及定义其在启动时的外观。清单文件包括应用程序的名称、图标、起始 URL、显示属性和背景颜色等属性。\u003C/p>\u003Cp>注意：这个文件对 PWA 至关重要，因为它决定了应用程序如何与设备的操作系统集成以及在用户的应用生态系统中如何呈现。\u003C/p>\u003Ch2>安卓PWA 的优势\u003C/h2>\u003Cp>渐进式网络应用程序（PWA）具有一系列优势，使其与传统网络应用程序和原生移动应用程序区分开来。\u003C/p>\u003Ch3>离线功能\u003C/h3>\u003Cp>PWA 的最大好处之一是它们能够在离线或低质量网络下运行。多亏了服务工作者，PWA 可以在首次访问时缓存重要资源，使应用程序在没有互联网连接的情况下也能加载和运行。\u003C/p>\u003Ch3>性能优势\u003C/h3>\u003Cp>PWA 是为性能而设计的。它们的应用外壳架构确保静态元素被缓存并立即可用，大大减少了加载时间。服务工作者还能高效地管理动态内容，使 PWA 比传统网页感觉更响应迅速、更敏捷。\u003C/p>\u003Cp>用户参与度和安装\u003C/p>\u003Cp>PWA 提供全屏、沉浸式的体验，可以像原生应用程序一样直接从用户的主屏幕启动。这个功能，再加上发送推送通知的能力，大大提高了用户的参与度。\u003C/p>\u003Cp>此外，PWA 的安装过程简单直接，不需要访问应用商店。用户只需轻点几下即可将 PWA 添加到主屏幕，使安装过程比下载传统应用程序更简单、更快。\u003C/p>\u003Ch3>PWA 的构建模块\u003C/h3>\u003Cp>渐进式网络应用程序（PWA）不仅仅是一种趋势；它们代表了网页开发实践的根本转变。本节将探讨使 PWA 成为可能的技术、促进其开发的框架和工具，以及一些突出其成功的实际案例研究。\u003C/p>\u003Ch2>安卓PWA 背后的技术\u003C/h2>\u003Cp>每个 PWA 的核心是三种主要技术：\u003C/p>\u003Cp>HTML5：用于在万维网上构建和呈现内容的标记语言。\u003C/p>\u003Cp>CSS3：用于描述用 HTML 编写的文档外观和格式的样式表语言。\u003C/p>\u003Cp>JavaScript：使网页具有交互性的编程语言，对于 PWA 的动态方面至关重要。\u003C/p>\u003Cp>这些技术由现代 API 如 Fetch（用于网络请求）、Cache（用于资源存储）和 Push（用于通过通知重新吸引用户）等补充。\u003C/p>\u003Ch2>PWA 开发的框架和工具\u003C/h2>\u003Cp>已经开发了几个框架和工具来简化 PWA 的创建：\u003C/p>\u003Cp>Workbox：一组库和 Node 模块，使缓存资产和充分利用用于构建 PWA 的功能变得容易。\u003C/p>\u003Cp>Lighthouse：一个开源的自动化工具，用于提高网页质量。它对性能、可访问性、渐进式网络应用程序等进行审核。\u003C/p>\u003Cp>Angular、React 和 Vue：流行的 JavaScript 框架，提供强大的 PWA 支持，使开发复杂应用程序更容易。\u003C/p>\u003Ch2>案例研究\u003C/h2>\u003Cp>任何技术的真正考验在于其在现实世界中的应用。以下是一些案例研究：\u003C/p>\u003Cul class=\"list-bullet\">\u003Cli\n          class=\"\"\n          style=\"\"\n          value=\"1\"\n        >Twitter Lite：作为 PWA 设计，Twitter Lite 导致每次会话的页面浏览量增加了 65%，推文发送量增加了 75%，跳出率降低了 20%。\u003C/li>\u003Cli\n          class=\"\"\n          style=\"\"\n          value=\"2\"\n        >《福布斯》：推出 PWA 后，《福布斯》的用户参与度增加了 100%。\u003C/li>\u003Cli\n          class=\"\"\n          style=\"\"\n          value=\"3\"\n        >Flipkart：印度最大的电子商务网站通过其 PWA 使网站停留时间增加了一倍。\u003C/li>\u003C/ul>\u003Cp>这些案例研究表明，PWA 完全能够兑现其承诺，为用户提供快速、引人入胜且可靠的网络体验，同时为开发者提供一个易于部署和维护的平台。\u003C/p>\u003Ch2>设计安卓PWA\u003C/h2>\u003Cp>设计渐进式网络应用程序（PWA）是一个细致的过程，需要深入了解用户界面和体验、响应式设计策略以及可访问性标准。本节将涵盖 PWA 设计的这些重要方面。\u003C/p>\u003Ch3>用户界面和体验考虑因素\u003C/h3>\u003Cp>PWA 的用户界面（UI）应该直观、吸引人且高效。关键是要关注以下几点：\u003C/p>\u003Cul class=\"list-bullet\">\u003Cli\n          class=\"\"\n          style=\"\"\n          value=\"1\"\n        >简洁性：干净整洁的 UI 有助于用户轻松导航应用程序。\u003C/li>\u003Cli\n          class=\"\"\n          style=\"\"\n          value=\"2\"\n        >一致性：统一的元素和可预测的交互建立信任和熟悉感。\u003C/li>\u003Cli\n          class=\"\"\n          style=\"\"\n          value=\"3\"\n        >反馈：对用户操作的即时清晰反馈确保流畅的体验。\u003C/li>\u003Cli\n          class=\"\"\n          style=\"\"\n          value=\"4\"\n        >性能：快速加载的界面极大地提高了用户满意度。\u003C/li>\u003C/ul>\u003Ch3>响应式设计策略\u003C/h3>\u003Cp>PWA 必须在所有设备和屏幕尺寸上无缝显示和运行。响应式设计策略包括：\u003C/p>\u003Cul class=\"list-bullet\">\u003Cli\n          class=\"\"\n          style=\"\"\n          value=\"1\"\n        >流体网格：使用灵活的网格布局，适应用户的屏幕。\u003C/li>\u003Cli\n          class=\"\"\n          style=\"\"\n          value=\"2\"\n        >灵活图像：确保图像在其包含元素内缩放。\u003C/li>\u003Cli\n          class=\"\"\n          style=\"\"\n          value=\"3\"\n        >媒体查询：应用 CSS 技术根据设备特征调整样式。\u003C/li>\u003Cli\n          class=\"\"\n          style=\"\"\n          value=\"4\"\n        >断点：定义网站内容将响应以提供最佳用户体验的点。\u003C/li>\u003C/ul>\u003Ch3>PWA 的可访问性\u003C/h3>\u003Cp>可访问性不是事后才考虑的事情；它是 PWA 设计的关键组成部分。为确保你的 PWA 可访问：\u003C/p>\u003Cul class=\"list-bullet\">\u003Cli\n          class=\"\"\n          style=\"\"\n          value=\"1\"\n        >语义 HTML：使用 HTML5 元素以获得更好的内容结构和屏幕阅读器兼容性。\u003C/li>\u003Cli\n          class=\"\"\n          style=\"\"\n          value=\"2\"\n        >键盘导航：确保所有功能都可以通过键盘访问。\u003C/li>\u003Cli\n          class=\"\"\n          style=\"\"\n          value=\"3\"\n        >ARIA 角色：实现 ARIA 角色和属性以增强复杂 UI 组件的可访问性。\u003C/li>\u003Cli\n          class=\"\"\n          style=\"\"\n          value=\"4\"\n        >对比度和颜色：使用高对比度的配色方案，避免仅将颜色作为传达信息的唯一手段。\u003C/li>\u003C/ul>\u003Ch2>开发 PWA\u003C/h2>\u003Cp>开发渐进式网络应用程序（PWA）是一个令人兴奋的旅程，涉及建立强大的开发环境、遵循结构化的构建过程以及采用有效的测试和调试技术。\u003C/p>\u003Cp>本节将引导你完成这些关键阶段。\u003C/p>\u003Ch3>设置开发环境\u003C/h3>\u003Cp>在深入进行 PWA 开发之前，建立一个支持必要技术和工具的环境至关重要。以下是你需要的：\u003C/p>\u003Cp>代码编辑器：选择像 Visual Studio Code 这样的代码编辑器，它对网络技术提供良好支持，并具有用于 PWA 开发的扩展。\u003C/p>\u003Cp>Node.js 和 npm：安装 Node.js 和 npm 以管理项目的包和依赖项。\u003C/p>\u003Cp>本地服务器：使用像 HTTP Server 或 Live Server 这样的本地服务器在本地测试你的 PWA。\u003C/p>\u003Cp>浏览器开发者工具：像 Chrome 和 Firefox 这样的现代浏览器提供用于测试 PWA 的开发者工具，包括服务工作者管理和清单调试。\u003C/p>\u003Ch3>构建 PWA 的逐步指南\u003C/h3>\u003Cp>构建 PWA 涉及几个关键步骤：\u003C/p>\u003Cp>创建应用外壳：构建你的 HTML、CSS 和 JavaScript，以形成 PWA 的基本 UI。\u003C/p>\u003Cp>实现服务工作者：编写服务工作者脚本以处理缓存和网络请求。\u003C/p>\u003Cp>配置清单文件：在 manifest.json 文件中定义你的应用程序的元数据、外观和起始 URL。\u003C/p>\u003Cp>启用离线功能：使用 Cache API 存储资产以供离线使用。\u003C/p>\u003Cp>添加推送通知：集成推送通知以重新吸引用户。\u003C/p>\u003Cp>使其可安装：确保你的 PWA 满足可安装性标准，以便用户将其添加到主屏幕。\u003C/p>\u003Cp>测试和调试技术：测试和调试对于确保你的 PWA 按预期工作至关重要。\u003C/p>\u003Cp>Lighthouse：使用 Lighthouse 审核你的 PWA 的性能、可访问性和最佳实践。\u003C/p>\u003Cp>服务工作者测试：在浏览器的开发者工具中测试服务工作者的注册、缓存和更新流程。\u003C/p>\u003Cp>响应式测试：使用开发者工具中的设备模拟检查你的应用程序的响应性。\u003C/p>\u003Cp>可访问性测试：使用像 axe 或 Wave 这样的工具测试可访问性合规性。\u003C/p>\u003Cp>调试：利用浏览器的调试工具设置断点并逐步执行你的代码以查找和修复问题。\u003C/p>\u003Ch3>挑战和限制\u003C/h3>\u003Cp>虽然渐进式网络应用程序（PWA）提供了许多好处，但它们也有自己的一系列挑战和限制。了解这些对于开发者来说至关重要，以便避开潜在的陷阱并提供强大的 PWA 体验。\u003C/p>\u003Ch3>浏览器兼容性问题\u003C/h3>\u003Cp>PWA 面临的主要挑战之一是浏览器兼容性。并非所有浏览器都在同等程度上支持 PWA 功能，这可能导致不同用户环境下的体验不一致。例如，服务工作者和 Cache API 在 Chrome、Firefox 和 Opera 中得到了很好的支持，但在其他浏览器中可能支持有限。开发者必须考虑这些差异，并实现回退或填充程序，以确保全面的功能。\u003C/p>\u003Ch3>安全问题\u003C/h3>\u003Cp>在网页开发中，安全至关重要，PWA 也不例外。由于 PWA 可以离线使用并且通常通过 HTTPS 提供服务，因此必须防范中间人攻击等安全风险。实现服务工作者等功能也会引入复杂性，需要仔细注意以避免暴露漏洞。定期进行安全审核并遵循最佳实践对于维护 PWA 的完整性至关重要。\u003C/p>\u003Ch3>克服常见障碍\u003C/h3>\u003Cp>开发者在创建 PWA 时可能会遇到各种障碍，例如：\u003C/p>\u003Cp>缓存策略：决定缓存什么以及何时更新缓存可能很复杂。制定一个平衡新鲜度和性能的策略很重要。\u003C/p>\u003Cp>用户采用：说服用户 "安装" PWA 可能具有挑战性。需要清楚地传达该过程的好处和简单性。\u003C/p>\u003Cp>功能对等：确保 PWA 与其原生应用程序对应版本提供类似的功能和性能可能很困难，特别是在处理特定于硬件的功能时。\u003C/p>\u003Ch3>安卓PWA 的未来\u003C/h3>\u003Cp>渐进式网络应用程序（PWA）的前景不断变化，新趋势不断涌现，对搜索引擎优化（SEO）产生重大影响，并对其发展做出令人兴奋的预测。让我们探索 PWA 的未来可能会是什么样子。\u003C/p>\u003Ch3>PWA 的新兴趋势\u003C/h3>\u003Cp>随着技术的进步，我们在 PWA 领域看到了几个新兴趋势：\u003C/p>\u003Cp>与原生功能集成：PWA 越来越多地获得对原生设备功能的访问权限，例如联系人列表、NFC 等，缩小了网络和原生应用程序之间的差距。\u003C/p>\u003Cp>增强现实（AR）和虚拟现实（VR）：将 AR 和 VR 融入 PWA 的趋势正在上升，提供沉浸式体验而无需单独下载。\u003C/p>\u003Cp>机器学习和人工智能：在 PWA 中利用机器学习和人工智能可以直接在浏览器中提供个性化体验和智能功能。\u003C/p>\u003Ch3>PWA 对 SEO 的影响\u003C/h3>\u003Cp>PWA 对 SEO 产生深远影响，原因有以下几点：\u003C/p>\u003Cp>速度和性能：PWA 快速且响应迅速，这是搜索引擎排名的关键因素。\u003C/p>\u003Cp>参与度指标：PWA 的类似应用程序的体验可以导致网站停留时间增加和跳出率降低，对 SEO 产生积极影响。\u003C/p>\u003Cp>移动优先索引：随着 Google 的移动优先索引，PWA 的移动友好特性使其在搜索排名中具有优势。\u003C/p>\u003Ch3>PWA 发展的预测\u003C/h3>\u003Cp>展望未来，我们可以对 PWA 的发展做出以下几个预测：\u003C/p>\u003Cp>广泛采用：随着更多企业认识到其好处，PWA 可能会成为移动网络体验的标准。\u003C/p>\u003Cp>增强功能：网络标准的持续发展可能会扩展 PWA 的功能，使其更强大、功能更丰富。\u003C/p>\u003Cp>无缝的离线体验：缓存和数据存储的改进可能会使离线体验变得如此无缝，以至于用户可能不会注意到在线和离线模式之间的区别。\u003C/p>\u003Ch2>关于ROIBest 安卓 PWA\u003C/h2>\u003Cp>PWA 的潜力巨大，并且在很大程度上仍未被充分开发的。目前市面上的PWA技术都还未成熟，而ROIBest除了可以带给开发者一个成熟的PWA技术。更是可以带给开发者相对完整流畅的广告链路去跑量，以及完整的数据回传。目前全球已经有1/8的安卓设备使用过ROIBest。这意味着全球1/8的安卓用户用户可以流畅体验，实现即点即用，无需下载，不用等待。现更有针对游戏的边玩边下，针对短剧的边看边下等功能。\u003C/p>\u003Cp>希望您能通过本文获得您想了解的信息，如果您在了解PWA的优势后产生了业务想法，可以尝试了解ROIBest – 安卓 PWA 永久包开创者（\u003Ca href=\"https://www.roibest.com?promoter_id=T0SCB&tpl_id=1&channel_id=13&links_no=1521972975283&rl=\">roibest.com\u003C/a>）。这个团队专注于提供优质的 PWA 解决方案，能够助力企业实现更出色的用户体验，推动业务不断增长。\u003C/p>\n        \u003Cimg\n          alt=\"PWA在短剧行业的落地实践：加速加载与转化率提升 — inline image\"\n          height=\"80\"\n          src=\"https://cms-r2.deepclick.com/img_v3_02hg_80864f88-e3ea-4a98-8853-4ef5d3f71f2g-1d5b07ad-typed-6305367667f9.png?w=1200&q=85\"\n          width=\"1200\"\n        />\n      \u003C/div>","https://www.roibest.com/zh-CN/resources/blog/learn-more-about-pwas-how-to-use-roibest",{"zh-CN":559},1784706001082]