feat: 拖拽布局-返回按钮

demoHtml/flex/css/index.css

@@ -171,7 +171,8 @@ html {
     justify-content: center;
 }
 
-#canvas-tabs {
+#canvas-tabs,
+#go-back {
     position: absolute;
     top: 20px;
     left: 50%;
@@ -185,6 +186,12 @@ html {
     box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
 }
 
+#go-back {
+    left: 60px;
+    background-color: unset;
+    box-shadow: unset;
+}
+
 .tab-button {
     padding: 8px 15px;
     border: none;

demoHtml/flex/index.html

@@ -71,6 +71,9 @@
                     </div>
                     <!-- 画布容器 -->
                     <div id="canvas-panel">
+                        <div id="go-back">
+                            <button class="tab-button active"><</button>
+                        </div>
                         <div id="canvas-tabs">
                             <button
                                 class="tab-button active"

demoHtml/flex/js/index.js

@@ -580,6 +580,10 @@
             currentComponent = null;
             hidePropsPanel();
         });
+
+        $('#go-back .tab-button').on('click', function () {
+            window.history.back();
+        });
     };
 
     // 抽取校验函数