feat: update

commit.sh

+git add --all
+git commit -m "feat: update"
+git push

dist/cjs/board/Drawboard/index.js

             if (_this.source.imgSrc) {
                 _this.target.style.display = 'block';
             }
-            _this.boardHolder.style.opacity = 'visible';
+            _this.boardHolder.style.visibility = 'visible';
             _this.boardHolder.style.zIndex = '9999';
             if (_this.toolbar) {
                 _this.toolbar.show();

dist/cjs/board/Whiteboard/index.js

         }
     };
     Whiteboard.prototype.show = function () {
-        this.activePage.show();
+        if (this.activePage) {
+            this.activePage.show();
+        }
     };
     Whiteboard.prototype.hide = function () {
-        this.activePage.hide();
+        if (this.activePage) {
+            this.activePage.hide();
+        }
     };
     Whiteboard.prototype.snap = function () {
         return {

src/board/Drawboard/index.ts

       this.target.style.display = 'block';
     }
 
-    this.boardHolder.style.opacity = 'visible';
+    this.boardHolder.style.visibility = 'visible';
     this.boardHolder.style.zIndex = '9999';
 
     if (this.toolbar) {

src/board/Whiteboard/index.ts

 
   /** 展示当前的 WhitePage */
   public show() {
-    this.activePage.show();
+    if (this.activePage) {
+      this.activePage.show();
+    }
   }
 
   public hide() {
-    this.activePage.hide();
+    if (this.activePage) {
+      this.activePage.hide();
+    }
   }
 
   /** 获取当前快照 */