docs(input): add focus & blur api doc

document/components/docs/en-US/input.md

@@ -30,7 +30,7 @@ Input component. You can use the `v-model` directive to create two-way data bind
   You can use the `clearable` attribute to toggle the clear button.
 
   Before 1.11.0, the `clearable` value only can be a Boolean value.
-  
+
   After 1.11.0 the `clearable` value can be a Boolean or an Object value.
 
   ```html
@@ -121,3 +121,10 @@ Input component. You can use the `v-model` directive to create two-way data bind
 | - | - | - |
 | focus | This event is triggered after the input box is focused. If input is disabled, it will not be triggered | e - event |
 | blur | This event is triggered after the input box blur | e - event |
+
+### Instance methods
+
+| Method name | Description |
+| - | - |
+| focus<sup>1.12.10+</sup> | Focus element |
+| blur<sup>1.12.10+</sup> | Blur element |

document/components/docs/en-US/textarea.md

@@ -110,3 +110,11 @@ Multi-line input box components. You can use the `v-model` directive to create t
 | - | - | - |
 | focus | This event is triggered after the textarea box is focused. If Textarea is disabled, it will not be triggered | e - event |
 | blur | This event is triggered after the textarea box blur | e - event |
+
+### Instance methods
+
+| Method name | Description |
+| - | - |
+| focus<sup>1.12.10+</sup> | Focus element |
+| blur<sup>1.12.10+</sup> | Blur element |
+

document/components/docs/zh-CN/input.md

@@ -29,7 +29,7 @@
   可通过`clearable`配置清空按钮。
 
   在 1.11.0 版本之前 `clearable` 的值是布尔类型的，表示是否展示清除按钮；
-  
+
   在 1.11.0 版本之后 `clearable` 可配置为布尔类型，还可以配置为对象。
 
   ```html
@@ -122,3 +122,10 @@
 | - | - | - |
 | focus | 输入框聚焦后触发此事件，如果禁用状态，则不触发 | e - 事件对象 |
 | blur | 输入框失焦后触发此事件 | e - 事件对象 |
+
+### 实例方法
+
+| 方法名 | 说明 |
+| - | - |
+| focus<sup>1.12.10+</sup> | 获得焦点 |
+| blur<sup>1.12.10+</sup> | 离焦 |

document/components/docs/zh-CN/textarea.md

@@ -101,3 +101,10 @@
 | - | - | - |
 | focus | 输入框聚焦后触发此事件，如果禁用状态，则不触发 | e - 事件对象 |
 | blur | 输入框失焦后触发此事件 | e - 事件对象 |
+
+### 实例方法
+
+| 方法名 | 说明 |
+| - | - |
+| focus<sup>1.12.10+</sup> | 获得焦点 |
+| blur<sup>1.12.10+</sup> | 离焦 |