场景：app跳转小程序，小程序点击按钮返回app并退出，加上退出事件后就无法返回app了？

<button class="completeBtn" open-type="launchApp" app-parameter="contractType={{contractType}}&cityid={{cityid}}" binderror="launchAppError" bindlaunchapp="launchSuccess" bindtap="successBtn">完成</button>

successBtn(){

wx.exitMiniProgram({

      success: function(res) {

        console.log('退出',res)

      },

      fail: function(res) {

        console.log('退出失败',res)

      }

    })

  },