feat: 优化选区功能，修复部分bug

src/component/Canvas/CanvasEditor/managers/CanvasManager.js

@@ -407,8 +407,8 @@ export class CanvasManager {
     // 居中所有画布元素，包括背景层和其他元素
     this.centerAllObjects();
 
-    // 重新渲染画布使变更生效
-    this.canvas.renderAll();
+    // // 重新渲染画布使变更生效
+    // this.canvas.renderAll();
   }
 
   /**
@@ -510,7 +510,7 @@ export class CanvasManager {
     }
 
     // 重新渲染画布
-    this.canvas.renderAll();
+    // this.canvas.renderAll();
   }
 
   /**
@@ -958,6 +958,9 @@ export class CanvasManager {
     // 解析JSON字符串
     try {
       const parsedJson = JSON.parse(json);
+      this.canvasWidth.value = parsedJson.canvasWidth || this.width;
+      this.canvasHeight.value = parsedJson.canvasHeight || this.height;
+      this.canvasColor.value = parsedJson.canvasColor || this.backgroundColor;
 
       return new Promise(async (resolve, reject) => {
         const tempLayers = JSON.parse(parsedJson?.layers) || [];
@@ -974,6 +977,7 @@ export class CanvasManager {
         }
 
         this.layers.value = tempLayers;
+        debugger;
 
         // this.canvasWidth.value = parsedJson.canvasWidth || this.width;
         // this.canvasHeight.value = parsedJson.canvasHeight || this.height;