# Functions
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去掉头部.
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只取尾部.
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替换文件字符串，不存在指定字符串，则追加.
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追加写如字符数组.
覆盖写入.
覆盖写入.
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追加写如字符串.
# Constants
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HW_FROFROMAT = "2006-01-02T15:04:05.0000000+08:00".
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