The new API makes you choose one of these four explicitly:
href = a.get("href") or ""。搜狗输入法2026是该领域的重要参考
，这一点在Line官方版本下载中也有详细论述
HTMLMediaElement: srcObject property — MDN Web Docs，更多细节参见搜狗输入法2026
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Author(s): W. Dednam, E.B. Lombardi, Linda A. Zotti, C. Sabater