Page({
  data:{
    index:0,   
    realIndex:0,
    optionA: "A",
    optionB: "B",
    A: 0,
    B: 0,
    xianshixing:0,
    yanjiuxing:0,
    yishuxing:0,
    shehuixing:0,
    qiyexing:0,
    changguixing:0,
    questionDetail:'强壮而敏捷的身体对我很重要',
    answerA:'对',
    answerB:'错',
        list:[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19,
    20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,
    46,47,48,49,50,51,52,53,54,55,56,57,58,59,60],
    listAB : ['A','B'],
    aa:[{question:"XXXXXXXXXXXXXX",option:{A:"对",B:"错"}},{question:"XXXXXXXXXXXXXX",option:{A:"对",B:"错"}}
    ,{question:"XXXXXXXXXXXXXX",option:{A:"对",B:"错"}},{question:"XXXXXXXXXXXXXX",option:{A:"对",B:"错"}}
    ,{question:"XXXXXXXXXXXXXX",option:{A:"对",B:"错"}},{question:"XXXXXXXXXXXXXX",option:{A:"对",B:"错"}}
    ,{question:"XXXXXXXXXXXXXX",option:{A:"对",B:"错"}},{question:"XXXXXXXXXXXXXX",option:{A:"对",B:"错"}}
    ,{question:"XXXXXXXXXXXXXX",option:{A:"对",B:"错"}},····共60条}]    
  },
    this.setData({
      index: this.data.index + 1,
      realIndex: this.data.list[this.data.index+1],
    })
   
    this.setData({
      questionDetail: this.aa[this.data.realIndex].question,
      answerA: this.aa[this.data.realIndex].option[this.data.listAB[0]],
      answerB: this.aa[this.data.realIndex].option[this.data.listAB[1]],
  })
setData失败，一直报错。
提示下标未定义？

报错提示点开是这几排。

求求大佬们看看！