JavaScript 的按位运算符会把操作数先转成 32 位有符号整数，所以结果需要用 >>> 0 转回无符号数。 移位操作也建议加上括号，因为不同语言的运算符优先级不同，靠直觉写很容易踩坑。 字节序方面，我统一使用大端序处理 4 字节与 32 位字之间的转换。

变异方法不是不能用，而是要想清楚“这个数组是不是我独占的”。函数内部临时构造的数组，用 push 循环填充完全没问题，性能还更好；但只要是入参、是状态、是缓存，就老老实实走非变异。这个判断标准比记哪个方法改不改原数组更实用，因为它直接对应“这段数据还有没有别人在用”。

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