如何使用 javascript 创建离线 Web 应用程序 [英] how to create an offline web app using javascript

问题描述

我正在寻找有关如何使用 html、JavaScript 和 jQuery 创建离线兼容 Web 应用程序的解决方案.我研究了服务工作者，但他们还不能与所有移动设备相提并论.我还查看了清单文件，它可以工作，但没有更新文件.所以现在我在这里寻求解决方案.我打算将此应用程序变成一个音乐网站，也可以是一个网络应用程序.我喜欢音乐，而且随时随地都可以听，所以我想知道如何保存网站文件以供离线使用，这样即使我没有 WiFi，也可以收听我保存的音乐.顺便说一下我想保存的文件是:

I am looking for a solution on how to create an offline compatible web app using html, JavaScript, and maybe jQuery. I looked into service workers, but they aren’t comparable with all mobile devices yet. I also looked at the manifest file thing, it worked but it didn’t update the files. So now I’m here asking for a solution. I intend this application to be a music website that can be a web app. I like music and i take it everywhere so I’m trying to find out how i can save the website files for offline use so even if I don’t have WiFi, i can listen to my saved music. btw the files I’d like to save are:

main.js
Main.css
Index.html

编辑 1另外，如果你知道如何正确使用 Service Worker，你能举个例子吗?

EDIT 1 Also, if you know how to properly use service workers, can you show an example?

推荐答案

未来参考:

1/在应用 root 文件夹中创建一个 Service Worker 文件.

1/ Create a service worker file in the app root folder.

示例 sw.js:

let cacheName = "core" // Whatever name
// Pass all assets here
// This example use a folder named «/core» in the root folder
// It is mandatory to add an icon (Important for mobile users)
let filesToCache = [
  "/",
  "/index.html",
  "/core/app.css",
  "/core/main.js",
  "/core/otherlib.js",
  "/core/favicon.ico"
]

self.addEventListener("install", function(e) {
  e.waitUntil(
    caches.open(cacheName).then(function(cache) {
      return cache.addAll(filesToCache)
    })
  )
})

self.addEventListener("fetch", function(e) {
  e.respondWith(
    caches.match(e.request).then(function(response) {
      return response || fetch(e.request)
    })
  )
})

---

2/在应用中的任意位置添加onload 事件:

window.onload = () => {
  "use strict";

  if ("serviceWorker" in navigator && document.URL.split(":")[0] !== "file") {
    navigator.serviceWorker.register("./sw.js");
  }
}

---

3/在应用根文件夹中创建一个ma​​nifest.json文件.

---

3/ Create a manifest.json file in the app root folder.

{
    "name": "APP",
    "short_name": "App",
    "lang": "en-US",
    "start_url": "/index.html",
    "display": "standalone"
  }

---

4/测试示例.从 root 文件夹启动 Web 服务器:

---

4/ Test example. Start a web server from the root folder:

php -S localhost:8090

访问 http://localhost:8090 一次.

使用 Ctrl + c 停止 Web 服务器.

Stop the web server with Ctrl + c.

刷新http://localhost:8090，页面应该有响应.

Refresh http://localhost:8090, the page should respond.

开发时要关掉，去掉 onload 事件，在 Firefox 中访问 about:debugging#workers 取消注册服务.

To switch off when developing, remove the onload event, and in Firefox visit about:debugging#workers to unregister the service.

---

最新版本的 Firefox 将直接在调试器中显示一个 application 选项卡.about:debugging#workers 不再有效.

https://developer.mozilla.org/en-US/docs/Tools/Application/Service_workers

---

Newest versions of Firefox are showing an application tab directly in the debugger instead. about:debugging#workers is not valid any more.

https://developer.mozilla.org/en-US/docs/Tools/Application/Service_workers

更多详情来源

Manifest.json 参考

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