update 抽屉

src/utils/app-drawer/app-drawer.vue

 <template>
-<div  class="drawer">
+<div v-if="isShow" class="drawer">
     <van-popup @closed="close" v-model="isShow" :position="placement" :style="{ width:'80%', height: '100%' }" >
             <component
             :is="viewname"