add:添加撤销、恢复和保存按钮

preview/views/MainView.vue

@@ -4,7 +4,20 @@
       <div class="title">可视化系统</div>
       <div class="web">pc</div>
       <div class="btn">
-        <a-button type="primary" @click="view">确定</a-button>
+        <a-space>
+          <a-button  @click="">
+            <template #icon>
+              <icon-left />
+            </template>
+          </a-button>
+          <a-button  @click="">
+            <template #icon>
+              <icon-right />
+            </template>
+          </a-button>
+          <a-button type="primary" @click="">保存</a-button>
+          <a-button type="primary" @click="view">预览</a-button>
+        </a-space>
       </div>
     </div>
     <div class="content">