html
<view data-index='{{index}}' bindtap='cancel'>删除</view>
js
cancel(e) {
let dynamicId = e.currentTarget.dataset.index//点击返回去的下标
let allNewsList = this.data.list//原始列表数组
allNewsList.splice(dynamicId, 1);//删除指定下标
}
this.setData({
list:allNewsList//返回新的列表长度
})
