小程序navigateBack，子页面传值给父页面

子页面

let page = getCurrentPages();
        let prevPage = page[page.length - 2];
        prevPage.setData({
          lxr :item.post_name,
          lxdh:item.post_mobilephone,
          yjdz:yjdz,
          yjdzxxdz:item.post_addressdetail
        });
        wx.navigateBack({
          delta:1
        })

父页面

let pages = getCurrentPages();
let currPage = pages[pages.length-1];
this.lxr = currPage.data.lxr;
this.lxdh = currPage.data.lxdh;
this.yjdz = currPage.data.yjdz;
this.yjdzxxdz = currPage.data.yjdzxxdz;
this.$apply();