reactor:更新提示只会提示一个;

src/utils/signalR.tsx

@@ -8,6 +8,7 @@ let notice: any = null;
  * @description 判断是否需要更新
  */
 async function judge() {
+	if (notice) notice.close();
 	// @ts-ignore'
 	const messageContent = () => {
 		return (