介绍 JavaScript 中的 at 方法，用于根据正负索引查找数组或字符串元素，支持从末尾开始查找（-1 表示最后一个元素）。
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at 方法 - 根据索引查找数组（或字符串）元素，负数则是从最后开始（-1），也支持正索引（0）。小巧方便。原文地址：http://www.deathghost.cn/article/javascript/104
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