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{ antialias: true }：开启了抗锯齿，让边缘光滑，不再有毛刺。
，这一点在heLLoword翻译官方下载中也有详细论述
Developers using the streams API are expected to remember to use options like highWaterMark when creating their sources, transforms, and writable destinations but often they either forget or simply choose to ignore it.
Answer (Playground):