:style="{height: slideheight+'rem'}"
slideheight: 2
v-if、v-else
例：
<div v-if="isshowslide" class="shopslideimg" style="height:2rem">
<shop-slide :shopimgslist="shopimgslist"></shop-slide>
</div>
<div v-else="isshowslide" class="shopslideimg" style="height:0rem">
<shop-slide :shopimgslist="shopimgslist"></shop-slide>
</div>
