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TITLE DESCRIPTION https://desion.net https://desion.net/post/2.html Sun, 16 Jan 2022 23:29:14 +0800 一、数组

1、Array.prototype.includes()

使用：arr.includes(findVal[, index])

index 默认值为0，表示从第几个开始查找，负数是从末尾起算

包含则返回 true，否则返回 false。

二、数值运算

1、

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