[ts] Property 'aaa' does not exist on type 'Window' 解决办法

　第一种：

(window as any).aaa

第二种：

declare global {
    interface Window { aaa: any; }
}

window.aaa = window.aaa || {};

第三种：

interface MyWindow extends Window {
    aaa(): void;
}

declare var window: MyWindow;