<template>
 <div class="captcha-row">
 <input class="captcha-input" placeholder="輸入驗證碼" auto-focus />
 <div v-if="showtime===null" class="captcha-button" @click="send">
  獲取驗證碼
 </div>
 <div v-else class="captcha-button">
  {{showtime}}
 </div>
 </div>
</template>

<script>
export default {
 data() {
 return {
  // 計時器,注意需要進行銷毀
  timeCounter: null,
  // null 則顯示按鈕 秒數(shù)則顯示讀秒
  showtime: null
 }
 },
 methods: {
 // 倒計時顯示處理
 countDownText(s) {
  this.showtime = `${s}s后重新獲取`
 },
 // 倒計時 60秒 不需要很精準
 countDown(times) {
  const self = this;
  // 時間間隔 1秒
  const interval = 1000;
  let count = 0;
  self.timeCounter = setTimeout(countDownStart, interval);
  function countDownStart() {
  if (self.timeCounter == null) {
   return false;
  }
  count++
  self.countDownText(times - count + 1);
  if (count > times) {
   clearTimeout(self.timeCounter)
   self.showtime = null;
  } else {
   self.timeCounter = setTimeout(countDownStart, interval)
  }
  }
 },
 send() {
  this.countDown(60);
 }
 },
}
</script>

<style lang="less" scoped>
.captcha-row {
 display: flex;
 .captcha-button {
 background: #048fff;
 color: white;
 display: flex;
 justify-content: center;
 align-items: center;
 padding: 4rpx 8rpx;
 width: 320rpx;
 border-radius: 4rpx;
 }
}
</style>