// 微信小程序睡眠X秒
  sleep(numberMillis) { 
    var now = new Date(); 
    var exitTime = now.getTime() + numberMillis; 
    while (true) { 
      now = new Date(); 
      if (now.getTime() > exitTime) {
        return;
      }
    } 
  },

// 微信小程序睡眠X秒
this.sleep(2000);