docs: display all less variables (#7604)

src/switch/README.md

@@ -108,3 +108,21 @@ export default {
 | ------ | --------------------------------- | -------------- |
 | change | Emitted when check status changed | _value: any_   |
 | click  | Emitted when component is clicked | _event: Event_ |
+
+### Less Variables
+
+How to use: [Custom Theme](#/en-US/theme).
+
+| Name | Default Value | Description |
+| --- | --- | --- |
+| @switch-size | `30px` | - |
+| @switch-width | `2em` | - |
+| @switch-height | `1em` | - |
+| @switch-node-size | `1em` | - |
+| @switch-node-background-color | `@white` | - |
+| @switch-node-box-shadow | `0 3px 1px 0 rgba(0, 0, 0, 0.05)` | - |
+| @switch-background-color | `@white` | - |
+| @switch-on-background-color | `@blue` | - |
+| @switch-transition-duration | `@animation-duration-base` | - |
+| @switch-disabled-opacity | `@disabled-opacity` | - |
+| @switch-border | `@border-width-base solid rgba(0, 0, 0, 0.1)` | - |

src/switch/README.zh-CN.md

@@ -124,3 +124,21 @@ export default {
 | ------ | ------------------ | -------------- |
 | change | 开关状态切换时触发 | _value: any_   |
 | click  | 点击时触发         | _event: Event_ |
+
+### 样式变量
+
+组件提供了下列 Less 变量，可用于自定义样式，使用方法请参考[主题定制](#/zh-CN/theme)。
+
+| 名称 | 默认值 | 描述 |
+| --- | --- | --- |
+| @switch-size | `30px` | - |
+| @switch-width | `2em` | - |
+| @switch-height | `1em` | - |
+| @switch-node-size | `1em` | - |
+| @switch-node-background-color | `@white` | - |
+| @switch-node-box-shadow | `0 3px 1px 0 rgba(0, 0, 0, 0.05)` | - |
+| @switch-background-color | `@white` | - |
+| @switch-on-background-color | `@blue` | - |
+| @switch-transition-duration | `@animation-duration-base` | - |
+| @switch-disabled-opacity | `@disabled-opacity` | - |
+| @switch-border | `@border-width-base solid rgba(0, 0, 0, 0.1)` | - |