小程序初始提交

cool-unix/cool/scroller/index.ts

@@ -0,0 +1,33 @@
+import { router } from "../router";
+
+class Scroller {
+	list: Map<string, ((top: number) => void)[]> = new Map();
+
+	// 触发滚动
+	emit(top: number) {
+		const cbs = this.list.get(router.path()) ?? [];
+		cbs.forEach((cb) => {
+			cb(top);
+		});
+	}
+
+	// 监听页面滚动
+	on(callback: (top: number) => void) {
+		const path = router.path();
+		const cbs = this.list.get(path) ?? [];
+		cbs.push(callback);
+		this.list.set(path, cbs);
+	}
+
+	// 取消监听页面滚动
+	off = (callback: (top: number) => void) => {
+		const path = router.path();
+		const cbs = this.list.get(path) ?? [];
+		this.list.set(
+			path,
+			cbs.filter((cb) => cb != callback)
+		);
+	};
+}
+
+export const scroller = new Scroller();