laundry/components/collapse/collapse.wxml

<view class="le " bindtap="change">
    <view class="flex ju-b" style="width: 100%;">
        <view class="tiaojian">使用条件</view>
        <van-icon name="arrow-down" class="{{down?'down':'up'}}" color="#A5A8AD" size="20rpx" />

    </view>
    <view class=" {{down?'content1':'content'}}">
        <view class="text" wx:for="{{list}}" wx:key="*this">
            {{item}}
        </view>
    </view>
</view>