docs for router.onReady

Author: yyx990803

docs/en/api/router-instance.md

@@ -59,3 +59,9 @@
   > 2.2.0+
 
   Dynamically add more routes to the router. The argument must be an Array using the same route config format with the `routes` constructor option.
+
+- **router.onReady(callback)**
+
+  > 2.2.0+
+
+  Queue a callback to be called when the router has completed the initial navigation. This is useful when you need to wait until all asynchronous route enter hooks / async components have been resolved, e.g. in server-side rendering.

docs/zh-cn/api/router-instance.md

@@ -53,3 +53,15 @@
     href: string;
   }
   ```
+
+- **router.addRoute(routes)**
+
+  > 2.2.0+
+
+  动态添加更多的路由规则。参数必须是一个符合 `routes` 选项要求的数组。
+
+- **router.onReady(callback)**
+
+  > 2.2.0+
+
+  添加一个会在第一次路由跳转完成时被调用的回调函数。此方法通常用于等待异步的导航钩子完成，比如在进行服务端渲染的时候。