测试场景：给出一个 200 行的混乱 Python 爬虫脚本，要求重构为面向对象结构，并输出 Mermaid 类图。
Unreferencing should put the object back onto its free list
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// Same for 'srcObject' catches MediaSource-based streams
The future perfect continuous passive and other transitive disorders of the mind
· 周杰 · 来源：tutorial资讯