docs($cn): document for themeConfig.serviceWorker.updatePopup

docs/default-theme-config/README.md

@@ -356,26 +356,32 @@ Note that it's `off` by default. If given `string`, it will be displayed as a pr
   Since `lastUpdated` is based on `git`, you can only use it in a `git` repository. As well, since the timestamp used comes from the git commit, it will display only after a first commit for a given page, and update only on subsequent commits of that page.
 :::
 
-## Service Workers
+## Service Worker
 
-The `themeConfig.serviceWorker` option allows you to configure about service workers.
+The `themeConfig.serviceWorker` option allows you to configure about service worker.
 
-### Popup UI to refresh contents
+::: tip
+Please do not confuse this option with [Config > serviceWorker](../config/README.md#serviceworker), [Config > serviceWorker](../config/README.md#serviceworker) is **site-level**, while this option is **theme-level**.
+:::
 
-The `themeConfig.serviceWorker.updatePopup` option enables the popup to refresh contents. The popup will be shown when the site is updated (the service worker is updated). It provides `refresh` button to allow users to refresh contents immediately.
+### Popup UI to refresh contents <Badge text="0.13.0+"/>
 
-::: tip NOTE
-If without the `refresh` button, the new service worker will be active after all clients are closed.
-This means that visitors cannot see new contents until they close all tabs of your site.
+The `themeConfig.serviceWorker.updatePopup` option enables the popup to refresh contents. The popup will be shown when the site is updated (i.e. service worker is updated). It provides `refresh` button to allow users to refresh contents immediately.
 
-But the `refresh` button activates the new service worker immediately.
+::: tip NOTE
+If without the `refresh` button, the new service worker will be active after all [clients](https://developer.mozilla.org/en-US/docs/Web/API/Clients) are closed. This means that visitors cannot see new contents until they close all tabs of your site. But the `refresh` button activates the new service worker immediately.
 :::
 
 ``` js
 module.exports = {
   themeConfig: {
     serviceWorker: {
-      updatePopup: true | {message: "New content is available.", buttonText: "Refresh"}
+      updatePopup: true // Boolean | Object, default to undefined.
+      // If set to true, the default text config will be: 
+      // updatePopup: { 
+      //    message: "New content is available.", 
+      //    buttonText: "Refresh" 
+      // }
     }
   }
 }

docs/zh/default-theme-config/README.md

@@ -351,6 +351,37 @@ module.exports = {
   由于 `lastUpdated` 是基于 `git` 的, 所以你只能在一个基于 `git` 的项目中启用它。
 :::
 
+## Service Worker
+
+`themeConfig.serviceWorker` 允许你去配置 Service Worker。
+
+::: tip 提示
+请不要将本选项与 [Config > serviceWorker](../config/README.md#serviceworker) 混淆，[Config > serviceWorker](../config/README.md#serviceworker) 是网站级别的配置，而本选项是主题级别的配置。
+:::
+
+### 刷新内容的弹窗 <Badge text="0.13.0+"/>
+
+开启 `themeConfig.serviceWorker.updatePopup` 选项，将开启一个能够刷新内容的弹窗。当网站更新（即 Service Worker 更新）时，它会提供一个 `refresh` 按钮，允许用户立刻刷新内容。
+
+::: tip 提示
+如果没有 `refresh` 按钮，新的 service worker 将在所有的 [clients](https://developer.mozilla.org/en-US/docs/Web/API/Clients) 关闭后才会处于活动状态。这意味着访问者在关闭你网站的所有标签之前将无法看到新内容。但是，`refresh` 按钮可以立即激活新的 Service Worker。
+:::
+
+``` js
+module.exports = {
+  themeConfig: {
+    serviceWorker: {
+      updatePopup: true // Boolean | Object, 默认值是 undefined.
+      // 如果设置为 true, 默认的文本配置将是: 
+      // updatePopup: { 
+      //    message: "New content is available.", 
+      //    buttonText: "Refresh" 
+      // }
+    }
+  }
+}
+```
+
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