微信小程序 置顶/取消置顶

wxml

<view wx:for="{{confirmlist}}" wx:for-item="confirm" wx:for-index="index" wx:key="{{ confirm.id }}" class='{{topcid==confirm.id?"top": "untop"}}' > 　　
　　<view data-selindex="{{index}}" bindtap="top"></view>
　　......
</view>

js

Page({
    data: {
        topflag:'',
        confirmlist:[],
    },
    // 置顶取消置顶
  top(e){
    var arr = []
    var confirmlist = {}
    this.setData({
      confirmlist: this.data.confirmlistyuan
    })
    var list = this.data.confirmlist
    var selindex = e.currentTarget.dataset.selindex
    for (let i in list) {
      arr.push(list[i]); //属性
    }
    var arritem = arr[selindex]
    arr.splice(selindex,1);
    console.log(selindex)
    if(selindex != this.data.topflag){
      this.setData({
        topflag: selindex
      })
      arr.splice(0, 0, arritem);
    }else{
      this.setData({
        topflag: ''
      })
      arr.splice(selindex, 0, arritem);
    }

    for (var i = 0, len = arr.length; i < len; i++) {
      confirmlist[i] = arr[i]
    }
    this.setData({
      confirmlist: confirmlist,
    })

  },

})
    

wxss

top{
  top: 0px;
  position: fixed !important;
}