study_wxapp/pages/exam/collection/index.js

let app = getApp()
Page({
  data: {
    preList:["A","B","C", "D", "E", "F"],
    from:0,
    size:10,
    item: {},
    next: false,
    loading:false,
    groupId:0,
    list: [],
  },
  onLoad: function(options) {
    let groupId = + options.groupId||0
    this.setData({groupId})
    this.loadData(  )
  },
  loadData( cb  ){
    let {size,from, groupId, list } = this.data
    this.setData({loading:true})
    app.formPost('Exam.GetErrorAnswerList', {groupId,from,size}).then(res => {
      if (res.code ==200) {
        if( from == 0){
          list = [];
        }
        this.setData({
          from: res.data.from,
          list: list.concat(res.data.list),
        });
      }
      this.setData({loading:false})
      cb&&cb()
    })
  },
  radioChange( e ){
    let index = e.currentTarget.dataset.index;
    let list = this.data.list
    list[index].select = +e.detail.value
    this.setData( {list} );
    this.delAnswer( list[index])
  },
  checkboxChange( e ){
    let index = e.currentTarget.dataset.index;
    let list = this.data.list
    list[index].select = +e.detail.value.sort().join("")
    let result = ""+list[index].result
    if (list[index].select == result ){
      list[index]._select = true
      this.delAnswer(list[index]  )
    }else{
      for( let i in e.detail.value){
        if(result.indexOf( e.detail.value[i] )==-1 ){
          list[index]._select = true
        }
      }
    }
    this.setData( {list} );
  },
  emptyAnswer(e){
    let list = this.data.list.map( item =>{
      item._select = false;
      item.select = 0
      return item
    })
    this.setData({list})
  },
  onPullDownRefresh() {
    if (!this.loading) {
      this.setData({list:[], from:0})
      this.loadData( this.stopPullDownRefresh )
    }
  },
  onReachBottom() {
    if (!this.loading && this.data.from > -1) {
      this.loadData(  )
    }
  },
  stopPullDownRefresh(){
    wx.stopPullDownRefresh()
  },
  delAnswer( info  ){
    let {id, parentId, select,result} = info;
    let list = this.data.list
    let skip = false
    let mselect = {};
    if( parentId > 0 ){
      for( let i in list){
        if( list[i].parentId == parentId ){
          if(list[i].select != list[i].result){
            skip = true
          }
          mselect[list[i].answerId] = list[i].select;
        }
      }
    }else{
      if( select!= result) skip = true;
    }
    app.formPost('Exam.DelErrorAnswer', {id,skip,mselect}).then(res => {
    }) 
  }
})