在app.js中添加如下两个方法即可：
// 设置需要回调的地址setCallbackUrl: function(mode) {return new Promise((resolve,reject) => {let pages = getCurrentPages(); //获取加载的页面let currentPage = pages[pages.length - 1]; //获取当前页面的对象let urlPage = ''; // 存储的跳转地址let url = currentPage.route; //当前页面urllet argumentsStr = '';let options = currentPage.options; //如果要获取url中所带的参数可以查看optionsfor (let key in options) {let value = options[key];argumentsStr += key + '=' + value + '&';}if(argumentsStr) {argumentsStr = argumentsStr.substring(0, argumentsStr.length - 1);urlPage = url + '?' + argumentsStr;} else {urlPage = url;}let callbackObj = {callbackUrl: `/${urlPage}`,mode: mode || 'redirectTo'}wx.setStorageSync('callbackObj', JSON.stringify(callbackObj));resolve();})},// 获取本地可以回调的地址getCallBackUrl: function() {return new Promise((resolve,reject) => {const callbackObj = wx.getStorageSync('callbackObj');if(callbackObj) {let resultObj = JSON.parse(callbackObj);let callbackUrl = resultObj.callbackUrl;let mode = resultObj.mode;mode == 'redirectTo' && wx.redirectTo({url: callbackUrl});mode == 'switchTab' && wx.switchTab({url: callbackUrl});mode == 'reLaunch' && wx.reLaunch({url: callbackUrl});mode == 'navigateTo' && wx.navigateTo({url: callbackUrl});} else {reject();}})},
跳转到登录页面前通过setCallbackUrl方法获取即将跳转的当前页面，当登录后调用getCallBackUrl方法，查看本地是否有需要跳转的地址，没有就在catch中执行登录后的正常逻辑，比如跳转到我的模块页面。代码如下:
app.getCallBackUrl().catch(() => {// catch中执行默认的操作wx.redirectTo({url: '/pages/my/mycenter/mycenter'})
})
