//html
 <view class="say_item"  bindtap="open"  data-id="{{item.id}}">




//js
open (e) {      //点赞点击事件
let dynamicId = e.currentTarget.dataset.id//点赞的时候传的id
        let allNewsList = this.data.list//列表数组
  for (let i = 0; i < allNewsList.length; i++) {
    if (dynamicId == allNewsList[i].id) {
      console.log(allNewsList[i])
      allNewsList[i].likeCount=allNewsList[i].likeCount+1//点赞数
      allNewsList[i].isLiked=true       //点赞状态
    }
  }
  this.setData({
       list:allNewsList,//重新定义列表
        })
}

方法二

w class="say_item"  bindtap="open"  data-index="{{item.index}}">




//js
open (e) {      //点赞点击事件
let index = e.currentTarget.dataset.index//获取下标
        let allNewsList = this.data.list//列表数组
 allNewsList[index].likeCount=allNewsList[index].likeCount+1//点赞数
      allNewsList[index].isLiked=true       //点赞状态
  this.setData({
       list:allNewsList,//重新定义列表
        })
}