scrollview中的image 无法调整zindex

使用scrollview 后图片zindex无法调整

<swiper :indicator-dots="true" indicator-color="rgba(0, 0, 0, .3)" style="background-color: #007AFF;" indicator-active-color="#FFFFFF">  
            <swiper-item v-for="(item, index) in info" :key="index"><image mode="scaleToFill " :src="item.url" class="swiper-image" /></swiper-item>  
        </swiper>  
        <view style="width: 90%;height: 100rpx;background-color: #0FAEFF; z-index: 999;margin-top: -30rpx;">  
            sfdjsdflk  
        </view>  
        </scroll-view>