逐步完成前后端服务器

frontend/node_modules/zrender/lib/mixin/Draggable.d.ts

@@ -0,0 +1,13 @@
+import Handler from '../Handler';
+import Element, { ElementEvent } from '../Element';
+export default class Draggable {
+    handler: Handler;
+    _draggingTarget: Element;
+    _dropTarget: Element;
+    _x: number;
+    _y: number;
+    constructor(handler: Handler);
+    _dragStart(e: ElementEvent): void;
+    _drag(e: ElementEvent): void;
+    _dragEnd(e: ElementEvent): void;
+}