ForEach循环渲染：

参数：

1. 要循环遍历的数组，Array类型
2. 遍历的回调方法，Function类型
3. 为每一项生成唯一标识符的方法，有默认生成方法，非必传

使用示例： 

interface Item {name: String,price: Number
}@Entry
@Component
struct Index {private arr:Array<Item> = [{name: '华为 Meta 50', price: 6999},{name: '华为 Meta 60 pro', price: 7999},{name: '华为 Meta X5', price: 12999},];build() {Column({space: 30}) {ForEach(this.arr,item=>{Row(){Column() {Text(item.name).fontWeight(FontWeight.Bold).margin({bottom: 10})Text('￥' + item.price)}}.width('100%').backgroundColor("#FFF").padding(20)})}.height('100%').backgroundColor("#999").justifyContent(FlexAlign.Center)};
}

效果展示：

---

if判断渲染：

使用示例：

interface Item {name: String,price: Number,discount?: Number
}@Entry
@Component
struct Index {private arr:Array<Item> = [{name: '华为 Meta 50', price: 6999, discount: 6666},{name: '华为 Meta 60 pro', price: 7999},{name: '华为 Meta X5', price: 12999},];build() {Column({space: 30}) {ForEach(this.arr,item=>{Row(){Column() {if(item.discount){Text(item.name).fontWeight(FontWeight.Bold).margin({bottom: 10})Text('原价：￥' + item.price).fontSize(14).decoration({ type: TextDecorationType.LineThrough })Text('折扣价：￥' + item.discount).textAlign(TextAlign.Start)Text('补贴：￥' + (item.price - item.discount)).textAlign(TextAlign.Start)}else{Text(item.name).fontWeight(FontWeight.Bold).margin({bottom: 10})Text('￥' + item.price)}}}.width('100%').backgroundColor("#FFF").padding(20)})}.height('100%').backgroundColor("#999").justifyContent(FlexAlign.Center)};
}

效果展示：