# Functions
转义json特殊字符.
执行shell命令，可设置执行超时时间.
判断文件是否存在及是否有权限访问.
格式化环境变量.
格式化环境变量.
GBK编码转换为UTF8.
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判断当前系统是否是windows.
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生成32位MD5摘要.
生成0-max之间随机数.
生成长度为length的随机字符串.
批量替换字符串.
# Constants
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# Structs
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