添加提示文案

src/views/operation/activity/detail.vue

@@ -37,7 +37,7 @@
           <el-table-column label="领取数量" align="center">
             <template slot-scope="scope">
               <el-form-item :prop="`deviceRespList.${scope.$index}.totalNum`" :rules="{required: true, trigger: 'change'}">
-                <el-input-number v-model="scope.row.totalNum" :controls="false" :min="1" />
+                <el-input-number v-model="scope.row.totalNum" :controls="false" :min="1" placeholder="请输入领取数量" />
               </el-form-item>
             </template>
           </el-table-column>