update zh-cn/application-dev/reference/arkui-ts/ts-basic-components-stepper.md.修改代码格式

修改代码格式
Signed-off-by: Nzhouxinping <xpzhoua@isoftstone.com>

zh-cn/application-dev/reference/arkui-ts/ts-basic-components-stepper.md

@@ -63,47 +63,50 @@ struct StepperExample {
           .fontColor(Color.Blue)
           .width(200)
           .lineHeight(50)
-          .margin({top:250})
+          .margin({ top: 250 })
       }
       .nextLabel('')
-      .position({x: '35%', y: 0})
+      .position({ x: '35%', y: 0 })
+
       StepperItem() {
         Text('Page Two')
           .fontSize(35)
           .fontColor(Color.Blue)
           .width(200)
           .lineHeight(50)
-          .margin({top:250})
-          .onClick(()=>{
+          .margin({ top: 250 })
+          .onClick(() => {
             this.firstState = this.firstState === ItemState.Skip ? ItemState.Normal : ItemState.Skip
           })
       }
       .nextLabel('Next')
       .prevLabel('Previous')
       .status(this.firstState)
-      .position({x: '35%', y: 0})
+      .position({ x: '35%', y: 0 })
+
       StepperItem() {
         Text('Page Three')
           .fontSize(35)
           .fontColor(Color.Blue)
           .width(200)
           .lineHeight(50)
-          .margin({top:250})
-          .onClick(()=>{
+          .margin({ top: 250 })
+          .onClick(() => {
             this.secondState = this.secondState === ItemState.Waiting ? ItemState.Normal : ItemState.Waiting
           })
       }
-      .position({x: '35%', y: 0})
+      .position({ x: '35%', y: 0 })
       .status(this.secondState)
+
       StepperItem() {
         Text('Page four')
           .fontSize(35)
           .fontColor(Color.Blue)
           .width(200)
           .lineHeight(50)
-          .margin({top:250})
+          .margin({ top: 250 })
       }
-      .position({x: '35%', y: 0})
+      .position({ x: '35%', y: 0 })
       .nextLabel('Finish')
     }
     .onFinish(() => {