# Functions
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判断文件夹是否存在.
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读取整个文件.
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获取时间戳秒.
计算表名.
读取整个文件.
检测数组中是否存在某个元素.
生产32位的md5字符串.
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post方式请求接口.
读取整个文件.
递归创建文件夹.
*
* 字符串去重复
*/.
Uniqid 随机数，length是需要返回的长度，只支持10~19位.
唯一标识.
# Structs
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图片上传结构体.
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