修改部分预览和列表加载bug

src/components/topology/PreviewToImg.vue

@@ -36,16 +36,6 @@ export default {
       require: true,
     },
   },
-  watch: {
-    canvasData: {
-      handler(n, o) {
-        this.$nextTick(() => {
-          this.init();
-        });
-      },
-      deep: true,
-    },
-  },
   data() {
     return {
       canvas: {},
@@ -82,7 +72,7 @@ export default {
       // 或 用window.topology对象 === 上面的canvas
       // topology.open(json);
       // 4. 如果json发送变化，重绘
-      this.canvas.render();
+      // this.canvas.render();
       this.imgData = this.canvas.toImage();
       this.canvas.destroy();
     },

src/views/topology/Preview.vue

@@ -87,11 +87,11 @@ export default {
         
       }
       this.canvas.open(this.topologyData);
-      this.canvas.lock(2);
+      this.canvas.lock(1);
       // 或 用window.topology对象 === 上面的canvas
       // topology.open(json);
       // 4. 如果json发送变化，重绘
-      this.canvas.render();
+      // this.canvas.render();
       this.$nextTick(()=>{
         this.onSizeWindow();
       })

src/views/topology/Workspace.vue

@@ -315,6 +315,7 @@ export default {
   destroyed() {
     document.removeEventListener("keydown", this.saveContent);
     this.canvas.destroy();
+    
   },
   computed: {
     scalecom: {