页面跳转与返回并回传数据的方法介绍

<view class="flex-wrp">
  <text style="width: 32%;">选择城市</text>
  <input style="width: 68%;" type="text" bindtap="city" placeholder="请选择城市" value="{{cityName}}"/>
  </view>

Page({
 data: {
 cityName:"深圳" #用来回传的关键字，默认深圳
 },
 city: function(e){
 wx.navigateTo({
  url: '../city/city'
 })
 }

})

cityNameClick: function (event) {
 var cityName = event.currentTarget.dataset.cityname;
 console.log(cityName);

 var pages = getCurrentPages();
 var currPage = pages[pages.length - 1]; //当前页面
 var prevPage = pages[pages.length - 2]; //上一个页面

 //直接调用上一个页面的setData()方法，把数据存到上一个页面中去
 prevPage.setData({
  cityName: cityName
 })

 wx.navigateBack();
 },