feat: 打印队列

electron/utils/PrintQueueManager.ts

@@ -1,3 +1,5 @@
+import {Queue} from "./Queue";
+
 class PrintQueueManager {
 
     private static queue: Queue<any> = new Queue();

electron/utils/Queue.ts

@@ -1,5 +1,5 @@
 
-class Queue<T> {
+export class Queue<T> {
     private items: T[] = [];
 
     // 入队操作