获取系统时间，可达到毫秒级，可将得到的时间换算成可用于计算的数据类型。此函数可被直接调用，也可用于参考以进一步的开发功能。-Get the system time, up to milliseconds, the time can be converted will be used to calculate the data type. This function can be called directly, Can also be used to further the developm