feat: 添加load default json逻辑

web/shellagent.js

@@ -1,10 +1,11 @@
-import { app } from "../../scripts/app.js";
+import { app } from "../scripts/app.js";
+
 app.registerExtension({
   name: "Shellagent.extension",
   async setup() {
-    window.parent.postMessage({
-      type: 'loaded'
-    }, '*');
+		window.parent.postMessage({
+			type: 'loaded'
+		}, '*');
     window.addEventListener('message', (event) => {
       if (event.data.type === 'save') {
         app.graphToPrompt().then(data => {
@@ -15,9 +16,23 @@ app.registerExtension({
           }, "*");
         });
       }
-      if (event.data.type === 'load') {
-        app.loadGraphData(event.data.data, true, false);
-      }
+			if (event.data.type === 'load') {
+				app.loadGraphData(event.data.data, true, false);
+			}
+			if (event.data.type === 'load_default') {
+				// 使用FileReader读取JSON文件
+				fetch('extensions/ComfyUI-ShellAgent-Plugin/shellagent_default.json')
+					.then(response => response.blob())
+					.then(blob => {
+						const reader = new FileReader();
+						reader.onload = function(e) {
+							const json = JSON.parse(e.target.result);
+							app.loadGraphData(json, true, false);
+						};
+						reader.readAsText(blob);
+					})
+					.catch(error => console.error('加载默认JSON文件时出错:', error));
+			}
     });
   },
 });