（二）在他人设立的淫秽、赌博等违法网站上投放广告推广信息的；
HTMLMediaElement: srcObject property — MDN Web Docs
，详情可参考同城约会
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它们就像是 iPhone 伸出来的三根触角，疯狂地从物理世界汲取信息。
have to manipulate manually via a global "break" pointer)