Unity3D 网页图片链接插件 Web Image Links，可以自动从网站上获得图片并显示成按钮。
Web Image Links – download Unity asset
Downloads images from the web and displays them on GUI buttons. Perfect for in game adverts, links to external websites, or richer dynamic images in your GUI.
Will cache images on device’s local storage (even between runs) to reduce web traffic.
All contained in a single script, possible to use without any coding
Loads either an image directly from a link, or the first image referenced in a containing web page.
More Info: _https://assetstore.unity.com/packages/tools/gui/web-image-links-10277