修改组件的错误

src/combination/listComponent.vue

@@ -3,7 +3,8 @@
     <div style="width: 100%;height: 40px;">
       <div style="margin: 10px 12px;float: left;">
         <el-button
-          v-for="item in customButton"
+          v-for="(item,index) in customButton"
+          :key="index"
           :type="item.type"
           :size="item.size"
           :icon="item.icon"