5

描述：

我们正在使用 sw precache 预先缓存脚本，因此要更新我们提供重新加载选项的脚本，因为我们正在监听 worker 消息以跳过等待新安装的 service worker 的未知原因，我们没有得到正确

导入脚本

// GETTING OLD SW reference (self) and NOT getting newly installed SW reference

self.addEventListener('message', function(event) {
    *// not working*
    self.skipWaiting();
});



// But if we put skipWaiting() in 'install' listener 
// it is getting correct new SW reference and working correctly

self.addEventListener('install', function(event) {
    // self.skipWaiting();
});

软件注册

if('serviceWorker' in window.navigator) {
      window.addEventListener('load', function() {
        window.navigator.serviceWorker.register("/serviceWorker.js").then(function(registration) {
          console.log("ServiceWorker registration successful with scope: ", registration);
          registration.onupdatefound = function() {
            console.log('NEW WILD WORKER HAS SPAWNED.!', registration);
            var installedWorker = registration.installing;
            installedWorker.onstatechange = function() {
              if (installedWorker.state === 'installed') {
                if (navigator.serviceWorker.controller) {
                  console.log('Updated content is available RELOAD!', navigator.serviceWorker.controller);
                  var el = document.getElementById('feature');
                  el.style['display'] = 'block';
                }
              }
            }
          }
        }).catch(function(error) {
          console.error("ServiceWorker registration failed: ", error);
        });
      });
      window.navigator.serviceWorker.addEventListener('controllerchange', function() {
        console.log('SERVICE WORKER UPDATED');
      });
    }

网络包配置

new SWPrecacheWebpackPlugin({
        cacheId: 'pwa',
        filename: 'serviceWorker.js',
        staticFileGlobsIgnorePatterns: [/\.map$/, /\.json$/, /_nch\.[0-9a-z]+\.[js, css]+/g, /webpackManifest\.[0-9a-z]+\.js/g, /.DS_Store\.[0-9a-z]+/g],
        importScripts: ['offline/offline.1a2b3c4df1.js'],
        dontCacheBustUrlsMatching: /./,
        minify: false,
        skipWaiting: false,
        runtimeCaching: [ {
          urlPattern: /_nch\.[0-9a-z]+\.[js, css]+/g,
          handler: 'fastest',
          options: {
            cache: {
              name: 'jd-internal-script',
              maxEntries: 10,
            },
          },
        }, {
          urlPattern: /webpackManifest\.[0-9a-z]+\.js/g,
          handler: 'networkFirst',
          options: {
            cache: {
              name: 'jd-root-doc',
            },
          },
        }],
      }),
4

2 回答 2

13

最好的文档skipWaiting()可以在https://developers.google.com/web/fundamentals/instant-and-offline/service-worker/lifecycle#skip_the_waiting_phase找到

您可以在处理程序中无条件地调用它install，也可以遵循您似乎正在做的模型，即监听message事件并skipWaiting()有条件地调用。

如果您采用条件路由，那么您应该修改客户端页面的代码以正确检测您正在注册的服务工作者何时进入waiting状态，并为用户提供与页面交互的选项，从而导致对应postMessage()于告诉服务人员skipWaiting()。根据您所说的，您已经尝试过了，但看起来您将消息发送到错误的服务工作者实例。

这是您页面的代码应如下所示：

// On your page:
if ('serviceWorker' in navigator) {
  window.addEventListener('load', function() {
    navigator.serviceWorker.register('service-worker.js').then(function(reg) {
      reg.onupdatefound = function() {
        var newSW = reg.installing;
        newSW.onstatechange = function() {
          if (newSW.state === 'waiting') {
            // This assumes there's a button with id='skip-waiting-button' that
            // users should click to get the new SW to activate immediately.
            var button = document.querySelector('#skip-waiting-button');
            button.addEventListener('click', function() {
              newSW.postMessage('skipWaiting');
            });
            // Assume that 'display' is 'none' initially.
            button.style.display = 'inline';
          }
          // Handle whatever other SW states you care about, like 'active'.
        };
      };
    })
  });
}

// In your service worker:
self.addEventListener('message', event => {
  if (event.data === 'skipWaiting') {
    self.skipWaiting();
  }
});
于 2017-09-25T17:47:23.940 回答
0

所以这就是我的想法...您的新服务人员仍在等待..因此事件侦听器仍在您的旧服务人员上..您发送的任何消息仍将被旧软件捕获（因为新软件正在等待） .

如果您唯一的情况是让新的 sw 起作用，您可以简单地刷新页面而不是发送消息

于 2017-09-22T12:09:39.383 回答