小程序navigateBack，子页面传值给父页面

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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();