微信小程序：flex布局实现换行

1、关键代码.wxml：

<view class="pay margin-top-40">
    <view class="info">
      <view class="pay-info-title margin-left-22 flex-start"> 请选择充值金额</view>

      <view class="flex-wrap margin-top-20">
        <view class="pay-item-select flex-center margin-left-22">
          <view class="pay-item-detail flex-center">
            <view>
              <view class="pay-item-detail-top flex-start">
                <view class="pay-jbi flex-center">
                  <image src="https://images.xxx.com/my_pay_jinbi.png" />
                </view>
                <view class="pay-item-detail-top-money flex-center">80</view>
              </view>
              <view>¥ 80.00</view>
            </view>
          </view>
        </view>

        <view class="pay-item flex-center margin-left-22">
          <view class="pay-item-detail flex-center">
            <view>
              <view class="pay-item-detail-top flex-start">
                <view class="pay-jbi flex-center">
                  <image src="https:/images.xxx.com/my_pay_jinbi.png" />
                </view>
                <view class="pay-item-detail-top-money flex-center">80</view>
              </view>
              <view>¥ 80.00</view>
            </view>
          </view>
        </view>

        <view class="pay-item flex-center margin-left-22">
          <view class="pay-item-detail flex-center">
            <view>
              <view class="pay-item-detail-top flex-start">
                <view class="pay-jbi flex-center">
                  <image src="https://images.xxx.com/my_pay_jinbi.png" />
                </view>
                <view class="pay-item-detail-top-money flex-center">80</view>
              </view>
              <view>¥ 80.00</view>
            </view>
          </view>
        </view>

        <view class="pay-item flex-center margin-left-22">
          <view class="pay-item-detail flex-center">
            <view>
              <view class="pay-item-detail-top flex-start">
                <view class="pay-jbi flex-center">
                  <image src="https://images.xxxx.com/my_pay_jinbi.png" />
                </view>
                <view class="pay-item-detail-top-money flex-center">80</view>
              </view>
              <view>¥ 80.00</view>
            </view>
          </view>
        </view>

        <view class="pay-item flex-center margin-left-22">
          <view class="pay-item-detail flex-center">
            <view>
              <view class="pay-item-detail-top flex-start">
                <view class="pay-jbi flex-center">
                  <image src="https://images.xxx.com/my_pay_jinbi.png" />
                </view>
                <view class="pay-item-detail-top-money flex-center">80</view>
              </view>
              <view>¥ 80.00</view>
            </view>
          </view>
        </view>

        <view class="pay-item flex-center margin-left-22">
          <view class="pay-item-detail flex-center">
            <view>
              <van-cell-group>
                <van-field type="number" maxlength='6' clearable custom-style="background-color: #F9F9F9;" placeholder="其它金额" input-align="center" bind:change="onChange" />
              </van-cell-group>
            </view>
          </view>
        </view>

      </view>
    </view>
  </view>

2、关键代码.wxss：

/* 实现换行 */
.flex-wrap {
  display: flex;
  flex-wrap: wrap;
  align-content: flex-start;
}

.pay .pay-item {
  width: 220rpx;
  height: 140rpx;
  background: #F9F9F9;
  border-radius: 20rpx;
  border: 2rpx solid #E9E9E9;
  margin-top: 20rpx;
}

.pay .pay-item-select{
  width: 220rpx;
  height: 140rpx;
  border:3rpx solid #FF5000;
  border-radius: 20rpx;
  background: #FFF6EE;
  margin-top: 20rpx;
}

.pay .pay-item-detail .pay-input{
  background-color: #F9F9F9;
}

效果：