edu-mini/components/code/code.wxml

<van-button size="mini" color="#FF4330" plain round custom-class="code-btn" bind:tap="getCode">
    <view wx:if="{{!isCd}}">{{codeText}}</view>
    <van-count-down wx:else time="{{ time }}" use-slot bind:finish="finished" bind:change="onChange">
        <view class="item">{{ timeData.seconds }}S</view>
    </van-count-down>
</van-button>