[Doc] add english document of all basic components

docs/examples-docs/en-US/stepper.md

@@ -3,7 +3,7 @@ export default {
   data() {
     return {
       stepper1: 1,
-      stepper2: null,
+      stepper2: 9,
     };
   }
 };
@@ -24,28 +24,39 @@ Vue.component(Stepper.name, Stepper);
 
 :::demo Basic Usage
 ```html
-<van-stepper v-model="stepper1"></van-stepper>
-<p class="curr-stepper">当前值：{{ stepper1 }}</p>
+<van-stepper v-model="stepper1" />
+```
+
+```javascript
+export default {
+  data() {
+    return {
+      value: 1
+    }
+  }
+}
 ```
 :::
 
 #### Disabled
-通过设置`disabled`属性来禁用 stepper
 
-:::demo 禁用状态
+:::demo Disabled
 ```html
-<van-stepper v-model="stepper1" disabled></van-stepper>
+<van-stepper v-model="stepper1" disabled />
 ```
 :::
 
 #### Advanced Usage
 
-默认是每次加减为1，可以对组件设置`step`、`min`、`max`、`defaultValue`属性
-
 :::demo Advanced Usage
 ```html
-<van-stepper v-model="stepper2" min="5" max="40" step="2" default-value="9"></van-stepper>
-<p class="curr-stepper">当前值：{{ stepper2 || 9 }}</p>
+<van-stepper
+  v-model="stepper2"
+  min="5"
+  max="40"
+  step="2"
+  default-value="9"
+/>
 ```
 :::
 
@@ -53,16 +64,16 @@ Vue.component(Stepper.name, Stepper);
 
 | Attribute | Description | Type | Default | Accepted Values |
 |-----------|-----------|-----------|-------------|-------------|
-| min | 最小值 | `String | Number` | `1` | - |
-| max | 最大值 | `String | Number` | - | - |
-| defaultValue | Default | `String | Number` | `1` | - |
-| step | 步数 | `String | Number` | `1` | - |
-| disabled | 是否禁用 | `Boolean` | `false` | - | 
-| disableInput | 是否禁用input框 | `Boolean` | `false` | - |
+| min | Min value | `String | Number` | `1` | - |
+| max | Max value | `String | Number` | - | - |
+| defaultValue | Default value | `String | Number` | `1` | - |
+| step | Value change step | `String | Number` | `1` | - |
+| disabled | Disable value change | `Boolean` | `false` | - | 
+| disableInput | Disable input | `Boolean` | `false` | - |
 
 ### Event
 
-| Event | Description | 回调参数 |
+| Event | Description | Arguments |
 |-----------|-----------|-----------|
-| change | 当绑定值变化时触发的事件 | 当前组件的值 |
-| overlimit | 点击不可用的按钮时触发 | - |
+| change | Triggered when value change | value: current value |
+| overlimit | Triggered when click disabled button | - |