# Functions
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创建文件 可能存在跨越目录创建文件的风险.
文件是否存在.
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判断字符串是否在切片中.
类似php的array_column($a, null, 'key').
创建目录.
四舍五入保留小数位.
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取两个切片的交集.
# Interfaces
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