验证码倒计时

this.countdownTime = null;
let send = 60;
--send;
this.getSmsCodeTip = `${send}s后重新获取`;
this.countdownTime = setInterval(()=>{
  --send;
  if(send === 0){
    this.getSmsCodeTip = '重新获取';
    send = 60;
    this.isCountDown = true;
    clearInterval(this.countdownTime);
  }else{
    this.getSmsCodeTip = `${send}s后重新获取`;
  }
},1000);