HarmonyOS List组件动态刷新数据问题

List(){ 
  ForEach(this.productdetaildata, (item: ProductDetailData) => { 
    ListItem() { 
      this.productDetailItem(item) 
    }.onClick(()=>{ 
      item.isRead=1; 
      item.readtimes++ 
      router.pushUrl({url:'pages/index', 
        params:new routerPDParams(item.discribe,item.producttitle,item.createtime,item.id,item.url,item.readtimes)}) 
 
    }) 
  }, (item: ProductDetailData) => JSON.stringify(item)) 
}.linearGradient({ 
  colors: [[0x4cdcff, 0.0],  [0x418fe, 1.0]]}).layoutWeight(1)