List组件如何设置多列

@Entry 
@Component 
struct ListLanesExample { 
  @State arr: string[] = ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '10', '11', '12', '13', '14', '15', '16', '17', '18', '19']; 
  @State alignListItem: ListItemAlign = ListItemAlign.Start; 
 
  build() { 
    Column() { 
      List({ space: 20, initialIndex: 0 }) { 
        ForEach(this.arr, (item: string) => { 
          ListItem() { 
            Text('' + item) 
              .width('100%') 
              .height(100) 
              .fontSize(16) 
              .textAlign(TextAlign.Center) 
              .borderRadius(10) 
              .backgroundColor(0xFFFFFF) 
          } 
          .border({ width: 2, color: Color.Green }) 
        }, (item: string) => item) 
      } 
      .height(300) 
      .width('90%') 
      .border({ width: 3, color: Color.Red }) 
      .lanes({ minLength: 40, maxLength: 40 }) 
      .alignListItem(this.alignListItem) 
 
      Button('点击更改alignListItem:' + this.alignListItem).onClick(() => { 
        if (this.alignListItem == ListItemAlign.Start) { 
          this.alignListItem = ListItemAlign.Center; 
        } else if (this.alignListItem == ListItemAlign.Center) { 
          this.alignListItem = ListItemAlign.End; 
        } else { 
          this.alignListItem = ListItemAlign.Start; 
        } 
      }) 
    }.width('100%').height('100%').backgroundColor(0xDCDCDC).padding({ top: 5 }) 
  } 
} 
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