// 复制数组（避免原数组被修改影响其他测试）
在 3D 世界里，一个物体 = 几何体 + 材质。
，这一点在服务器推荐中也有详细论述
When a host runtime provides a byte-oriented ReadableStream from the runtime itself, for instance, as the body of a fetch Response, it is often far easier for the runtime itself to provide an optimized implementation of BYOB reads, but those still need to be capable of handling both default and BYOB reading patterns and that requirement brings with it a fair amount of complexity.
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