微信小程序 详解页面跳转与返回并回传数据

<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(); },