message: [Doc] update dialog document
diff: @@ -44,6 +44,24 @@ Used to confirm some messages, including a confirm button and a cancel button
  });
  ```
  +#### Asnyc Close
  +
  +```js
  +function beforeClose(action, done) {
  + if (action === 'confirm') {
  + setTimeout(done, 1000);
  + } else {
  + done();
  + }
  +}
  +
  +Dialog.confirm({
  + title: 'Title',
  + message: 'Content',
  + beforeClose
  +});
  +```
  +
  #### $dialog Method
  After import the Dialog component, the $dialog method is automatically mounted on Vue.prototype, making it easy to call within a vue component.
  @@ -58,6 +76,30 @@ export default {
  }
  ```
  +#### Advanced Usage
  +
  +If you need to render vue components within a dialog, you can use dialog component.
  +
  +```html
  +<van-dialog
  + v-model="show"
  + title="Title"
  + show-cancel-button
  +>
  + <img src="https://img.yzcdn.cn/1.jpg">
  +</van-dialog>
  +```
  +
  +```js
  +export default {
  + data() {
  + return {
  + show: false
  + };
  + }
  +}
  +```
  +
  ### Methods
  | Name | Attribute | Return value | Description |
  @@ -87,51 +129,6 @@ export default {
  | beforeClose | Callback before close,<br>call done() to close dialog,<br>call done(false) to cancel loading | (action: string, done: function) => void | - |
  | getContainer | Return the mount node for Dialog | `String | () => HTMLElement` | `body` |
  -
  -#### Advanced Usage
  -
  -If you need to render vue components within a dialog, you can use dialog component.
  -
  -```html
  -<van-dialog v-model="show" :asyncConfirm="onClickConfirmAsync">
  - <van-field
  - v-model="username"
  - label="Username"
  - placeholder="Username"
  - />
  - <van-field
  - v-model="password"
  - type="password"
  - label="Password"
  - placeholder="Password"
  - />
  -</van-dialog>
  -```
  -
  -```js
  -Vue.use(Dialog);
  -
  -export default {
  - data() {
  - return {
  - show: false,
  - username: '',
  - password: ''
  - };
  - },
  -
  - methods: {
  - beforeClose(action, done) {
  - if (action === 'confirm') {
  - setTimeout(done, 1000);
  - } else {
  - done();
  - }
  - }
  - }
  -}
  -```
  -
  ### API
  | Attribute | Description | Type | Default |
  