但直接对输入数组使用 Array.prototype.reduce () 遍历有一个缺陷： 输入可能存在缺失元素 ，无法通过"当前元素与下一元素比较"来判定连续性。因此更稳妥的做法是： 不遍历输入数组，而是遍历固定的星期集合 ，以七天作为参照系逐天检查。

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