代码如下：

 wx.showActionSheet({
      itemList: ['删除'],
      success(res) {
        console.log(res.tapIndex)
        db.collection('cart').doc(event.target.dataset.id).remove({
          success: res =>{
            console.log('删除成功',res)
            wx.showToast({
              title: '删除成功',
              icon:'none'
            })
            let list = this.data.list.splice(event.target.dataset.index,1)//报错
            console.log('删除：',list)
            this.setData({
              list: list
            })
           
          }
        })
      },
      fail(res) {
        console.log(res.errMsg)
      }
    })