基于 Vant、Vue3 倒计时按钮组件的实现

Vant 没有提供倒计时按钮组件，手动实现一下。

// CountDownButton.vue 实现
<template>
  <Button
    style="min-width: 80px;"
    size="small"
    type="primary"
    :disabled="countDownButtonArgs.timing"
    @click="emit('click', successCallback)"
  >{{ loading ? loadingText : countDownButtonArgs.timing ? countDownButtonArgs.count : buttonText }}</Button>
</template>
<script setup lang="ts">
import { reactive } from 'vue'
import { Button } from 'vant'

const props = defineProps({
  maxSecondNum: {
    type: Number,
    default: 60
  },
  buttonText: {
    type: String,
    default: '获取验证码'
  },
  loadingText: {
    type: String,
    default: '发送中'
  },
  loading: {
    type: Boolean,
    default: false
  }
})
type EmitsType = { (e: 'click', successCallback: () => void): void }
const emit = defineEmits<EmitsType>()

const countDownButtonArgs = reactive<{ timing: boolean; count: number }>({
  timing: false,
  count: 0
})

const successCallback = () => {
  countDownButtonArgs.timing = true
  countDownButtonArgs.count = props.maxSecondNum
  const timer = setInterval(() => {
    const { count } = countDownButtonArgs
    if (count > 0 && count <= props.maxSecondNum) {
      countDownButtonArgs.count--;
    } else {
      countDownButtonArgs.timing = false
      clearInterval(timer)
      countDownButtonArgs.count = 0
    }
  }, 1000)
}
</script>
<style lang="less">
</style>

// 使用举例
<template>
  <div>
    <NavBar title="用户登录"></NavBar>
    <Form @submit="onLogin">
      <CellGroup inset>
        <Field
          v-model="phone"
          name="tel"
          label="手机号"
          :rules="[{ required: true, message: '请输入' }]"
        />
        <Field
          v-model="code"
          type="password"
          name="password"
          label="验证码"
          :rules="[{ required: true, message: '请输入' }]"
        >
          <template #button>
            <CountDownButton :loading="loading" @click="getCodeFn"></CountDownButton>
          </template>
        </Field>
      </CellGroup>
      <div style="margin: 16px;">
        <Button round block type="primary" native-type="submit">登录</Button>
      </div>
    </Form>
  </div>
</template>

<script setup lang="ts">
import { ref } from "vue";
import { Form, Field, CellGroup, Button, NavBar, Toast } from 'vant'
import CountDownButton from '../../../components/CountDownButton.vue'
import { sendSmsCode, smsLogin } from './api'
import { useRouter } from 'vue-router'

const router = useRouter()

const phone = ref('');
const code = ref('');
const onLogin = async () => {
  const b = await smsLogin(phone.value, code.value)
  if (b) {
    Toast('登录成功')
    router.push('/tvs/home')
  }
};

const loading = ref(false)
const getCodeFn = async (successCallback: () => void) => {
  if (!phone.value) { Toast('请输入手机号'); return; }
  loading.value = true
  const b = await sendSmsCode(phone.value)
  loading.value = false
  successCallback()
  if (b) { Toast('验证码发送成功'); }
}
</script>

<style lang="less">
</style>

效果如下