{
 "navigateToMiniProgramAppIdList": ["wx5a3a7366fd07e119"]
}

<button bindtap="toTCaptcha">驗證</button>

toTCaptcha: function () {
  wx.navigateToMiniProgram({
   appId: 'wx5a3a7366fd07e119',
   path: '/pages/captcha/index',
   extraData: {
    appId: 'appId' //您申請的驗證碼的 appId
   }
  })
 }

App({
 // ...
 onShow: function(options) {
  // 解決各類回調(diào)的兼容問題
  if (!this.captchaTicketExpire) this.captchaTicketExpire = {};

  if (options.scene === 1038 && options.referrerInfo.appId === 'wx5a3a7366fd07e119') {
   const result = options.referrerInfo.extraData;
   if (result.ret === 0) {
    const ticket = result.ticket;
    if (!this.captchaTicketExpire[ticket]) {
     this.captchaResult = result;
     this.captchaTicketExpire[ticket] = true;
    }
   } else {
    // 用戶關(guān)閉了驗證碼
    // 這里可以加上一些驗證失敗提示
   }
  }
 },
 // ...
});

// page.js
const app = getApp()

Page({
 data: {
  // ...
 },
 onShow() {
  const captchaResult = app.captchaResult;
  app.captchaResult = null; // 驗證碼的票據(jù)為一次性票據(jù)，取完需要置空
  if (captchaResult && captchaResult.ret === 0) {
   // 將驗證碼的結(jié)果返回至服務(wù)端校驗，以及后續(xù)的操作
   // const ticket = captchaResult.ticket;
   // const randstr = captchaResult.randstr;
  }
 },
 // ...
});