balance.js中已使用reLaunch跳转，去掉支付成功页返回按钮监听；

const/actioncmd.js

@@ -82,6 +82,3 @@ export const ACTION_VERIFY_FAILED = "ACTION_VERIFY_FAILED";
 
 //退出事件
 export const ACTION_QUIT = "ACTION_QUIT";
-
-//支付成功页点击返回按钮
-export const ACTION_PAYSUCCESS_PAGE_BACK = "ACTION_PAYSUCCESS_PAGE_BACK";
\ No newline at end of file

pages/paysuccess/paysuccess.js

@@ -4,26 +4,6 @@ import { ACTION_GO_HOME } from '../../const/actioncmd'
 import { ACTION_PAYSUCCESS_PAGE_BACK } from '../../const/actioncmd'
 
 Page({
-  //回退到上一个页面
-  events: {
-    onBack(e) {
-      console.log('onBack触发');
-      my.ix.sendBuddyMessage({
-        // 填入目标小程序的 AppID
-        target: getApp().globalData.backScreenAppId,
-        data: {
-          action: ACTION_PAYSUCCESS_PAGE_BACK,
-          data: null
-        },
-        success: (res) => {
-          e.preventDefault();
-        },
-        fail: (res) => {
-          console.info(`sendBuddyMessage failed: ${JSON.stringify(res)}`);
-        }
-      });
-    }
-  },
 
   data: {
     orderPriceYuan: "--.--",