docs: add zIndex to docs of Modal, ref: 2aa3437

components/modal/index.en-US.md

@@ -34,6 +34,7 @@ and so on.
 | wrapClassName | The class name of the container of the modal dialog | string   | - |
 | afterClose | Specify a function that will be called when modal is closed completely. | function | - |
 | getContainer | Return the mount node for Modal | (instance): HTMLElement | () => document.body |
+| zIndex | To set the `z-index` of Modal | Number | 1000 |
 
 #### Destroy on close
 
@@ -75,6 +76,7 @@ The properties of the object are follows:
 | okType    | type of the confirmation button                              | string        | primary   |
 | cancelText | Text of cancel button    | string           | Cancel       |
 | maskClosable | Determine whether to close the modal dialog when clicked mask of it. | Boolean   | `false`       |
+| zIndex | To set the `z-index` of Modal | Number | 1000 |
 
 All the `Modal.method`s will return a reference, and then we can close the popup by the reference.
 

components/modal/index.zh-CN.md

@@ -33,6 +33,7 @@ title: Modal
 | wrapClassName | 对话框外层容器的类名 | string   | - |
 | afterClose | Modal 完全关闭后的回调 | function | 无 |
 | getContainer | 指定 Modal 挂载的 HTML 节点 | (instance): HTMLElement | () => document.body |
+| zIndex | 设置 Modal 的 `z-index` | Number | 1000 |
 
 #### 清空旧数据
 
@@ -73,6 +74,7 @@ title: Modal
 | okType     | 确认按钮类型     | string           | primary   |
 | cancelText | 取消按钮文字    | string           | 取消       |
 | maskClosable | 点击蒙层是否允许关闭 | Boolean   | `false`    |
+| zIndex | 设置 Modal 的 `z-index` | Number | 1000 |
 
 以上函数调用后，会返回一个引用，可以通过该引用关闭弹窗。