# Functions
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Debug 会调试模式下打印caller，其他忽略，减少开销.
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IsDebugEnabled 是否打开了debug.
JsonDebug Json格式的debug.
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JsonInfo 会输出json格式的日志，json日志在单独的文件里.
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JsonWith 设置默认的field，如模块名称等.
MergeFields 合并，至少有一个参数，结果不影响原来的数据 不要直接修改f，防止并发问题.
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PanicStack 从panic中恢复并打印日志 注意recover必须在当前函数调用.
RegisterDebugSwitchCallback 注册debug开关切换的回调 注意某些组件并不能在运行时修改debug模式.
UnRegisterDebugSwitchCallback 移除debug开关的回调 会将cb重置为debug为false的状态.
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# Constants
ConsoleOut 控制台输出.
ErrorFileOut 错误日志.
InfoFileOut 一般日志.
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NormalOut 一般输出.
NormalOutWithTrack 有一般输出，也有json的track.
TrackFileOut json日志.
# Variables
Builder 初始化Logger的builder，由于配置项太多.