思路:给定文件,写入读取(fopen ,fwrite……) 如果大于1M 则重写备份 传给一个内容, 判断大小,如果大于1M,备份 小于则写入
定义一个常量,创建一个文件的名称
判断日志是否大于1M
清除缓存,则创建.bak文件。
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