yifengxcx/pages/plan/plan.js

// pages/plan/plan.js
const app = getApp()
const host = app.globalData.host;
Page({
  data: {
    array1:['特种作业'],
    array2: [],
    array3: [],
    index1:-1,
    index2: -1,
    index3: -1,
    list:[]
  },
  onLoad: function (options) {
    this.getData()
    wx.request({
      url: host + '/api/wx/sujectitem',
      success: res => {
        this.setData({
          array1: res.data.data
        })
      }
    })
  },
  bindPickerChange:function(e){   
    if (e.target.dataset.id == 1) {
      let list = this.data.array1[e.detail.value].children
      console.log(list)
      this.setData({
        index1: e.detail.value,
        array2:list,
        array3:[],
        index2:-1,
        index3: -1
      })
    };
    if (e.target.dataset.id == 2) {
      let list = this.data.array2[e.detail.value].children
      this.setData({
        index2: e.detail.value,
        array3: list,
        index3: -1
      })
    };
    if (e.target.dataset.id == 3) {
      this.setData({
        index3: e.detail.value
      })
    };
    this.getData();
  },
  getData:function(){
    var parm={}
    if (this.data.index1>=0){
      parm.subject_item0 = this.data.array1[this.data.index1].name
    }
    if (this.data.index2 >= 0) {
      parm.subject_item1 = this.data.array2[this.data.index2].name
    }
    if (this.data.index3 >= 0) {
      parm.subject_item2 = this.data.array3[this.data.index3].name
    }  
    wx.request({
      url: host+'/api/wx/class/list',
      method:'GET',
      data: parm,
      success:res=>{
        this.setData({
          list:res.data.data
        })
      }
    })
  },

  onReady: function () {

  },

  /**
   * 生命周期函数--监听页面显示
   */
  onShow: function () {

  },

  /**
   * 生命周期函数--监听页面隐藏
   */
  onHide: function () {

  },

  /**
   * 生命周期函数--监听页面卸载
   */
  onUnload: function () {

  },

  /**
   * 页面相关事件处理函数--监听用户下拉动作
   */
  onPullDownRefresh: function () {

  },

  /**
   * 页面上拉触底事件的处理函数
   */
  onReachBottom: function () {

  },

  /**
   * 用户点击右上角分享
   */
  onShareAppMessage: function () {

  }
})