小程序怎样让wx.navigateBack更好用的方法实现

wx.navigateBack({
 delta: 2
})

<!-- pages/balance/index.wxml -->
<web-view src="{{url}}"></web-view>

Page({
 data: {
 url: 'https://balance/url'
 },
 onShow() {
 // ...
 },
 onHide() {
 // ...
 }
})

const URL = 'https://balance/url'
Page({
 data: {
 url: URL
 },
 onShow() {
 this.setData({
 url: URL
 })
 },
 onHide() {
 setTimeout(() => {
 this.setData({
 url: ''
 })
 }, 800)
 }
})

Page({
 data: {},
 onTopup() {
 wx.requestPayment({
 // ...
 success(res) {
 wx.navigateBack()
 }
 })
 }
})

const URL = 'https://balance/url'
Page({
 data: {
 url: URL,
 isPaySuccess: false
 },
 onShow() {
 if (this.data.isPaySuccess) {
 this.setData({
 url: URL + '?refresh=1'
 })
 }
 }
})

Page({
 data: {},
 onTopup() {
 wx.requestPayment({
 // ...
 success(res) {
 let pages = getCurrentPages()
 let pageA = pages[pages.length - 2]
 pageA.setData({
  isPaySuccess: true
 })
 wx.navigateBack()
 }
 })
 }
})

function back(config) {
 let prevPageData = config.prevPageData
 let delta = config.delta || 1
 if (prevPageData) {
 let pages = getCurrentPages()
 let prevPage = pages[pages.length - (delta + 1)]
 prevPage.setData(config.prevPageData)
 }
 wx.navigateBack(config)
}

let back = require('../utils/back')
Page({
 data: {},
 onTopup() {
 wx.requestPayment({
 // ...
 success(res) {
 back({
  prevPageData: {
  isPaySuccess: true
  }
 })
 }
 })
 }
})

Page({
 data: {},
 onTopup() {
 wx.requestPayment({
 // ...
 success(res) {
 this.$back({
  prevPageData: {
  isPaySuccess: true
  }
 })
 }
 })
 }
})