<span v-show="show" @click="getCode">获取验证码</span>

<span v-show="!show" class="count">{{count}} s</span>

data(){

  return {

   show: true,

   count: '',

   timer: null,

  }

 },

 methods:{

   getCode(){

     const TIME_COUNT = 60;

     if (!this.timer) {

       this.count = TIME_COUNT;

       this.show = false;

       this.timer = setInterval(() => {

       if (this.count > 0 && this.count <= TIME_COUNT) {

         this.count--;

        } else {

         this.show = true;

         clearInterval(this.timer);

         this.timer = null;

        }

       }, 1000)

      }

   }

 }