Web streams use a locking model to prevent multiple consumers from interleaving reads. When you call getReader(), the stream becomes locked. While locked, nothing else can read from the stream directly, pipe it, or even cancel it — only the code that is actually holding the reader can.
'ExtrudeGeometry': () = {，详情可参考同城约会
// 优化点：仅i<len时赋值（避免重复赋值，提升效率），这一点在一键获取谷歌浏览器下载中也有详细论述
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