小程序tabbar跳转传参

//非tabbar页面
var app = getApp();
Page({ 
 data: {
    number:''
  },
 onLoad(){  
   this.data()
 },
 data:function(){
    var that=this
    wx.request({
      url: 'https://balabalaa',
      method: 'POST',
      data: {},
      header: {
        "Content-Type": " application/json"
      },
      success: function (res) {
         that.setData({
           number:res.data.number
         })
         var Number = that.data.number//传参的值
         app.Numberdata=Number//tabbar传递的参数 
         wx.switchTab({
            url: '../tabbar/tabbar',
        })
      }
   }) 
 }
//tabbar页面
var app = getApp(); 
Page({
     onLoad: function (options) {
        let val = app.Numberdata;//获取参数
        console.log(val);
    }
})