xampp mysql启动失败

不管出现的是任何问题，首先查看错误日志是必须的。

错误日志

这次的错误如下

InnoDB: using atomic writes.
2020-11-02 20:16:23 0 [Note] InnoDB: Mutexes and rw_locks use Windows interlocked functions
2020-11-02 20:16:23 0 [Note] InnoDB: Uses event mutexes
2020-11-02 20:16:23 0 [Note] InnoDB: Compressed tables use zlib 1.2.11
2020-11-02 20:16:23 0 [Note] InnoDB: Number of pools: 1
2020-11-02 20:16:23 0 [Note] InnoDB: Using SSE2 crc32 instructions
2020-11-02 20:16:23 0 [Note] InnoDB: Initializing buffer pool, total size = 16M, instances = 1, chunk size = 16M
2020-11-02 20:16:23 0 [Note] InnoDB: Completed initialization of buffer pool
2020-11-02 20:16:23 0 [Note] InnoDB: Setting log file \xampp\mysql\data\ib_logfile101 size to 5242880 bytes
2020-11-02 20:16:23 0 [Note] InnoDB: Setting log file \xampp\mysql\data\ib_logfile1 size to 5242880 bytes
2020-11-02 20:16:23 0 [Note] InnoDB: Renaming log file \xampp\mysql\data\ib_logfile101 to \xampp\mysql\data\ib_logfile0
2020-11-02 20:16:23 0 [Note] InnoDB: New log files created, LSN=300531
2020-11-02 20:16:23 0 [Note] InnoDB: 128 out of 128 rollback segments are active.
2020-11-02 20:16:23 0 [Note] InnoDB: Creating shared tablespace for temporary tables
2020-11-02 20:16:23 0 [Note] InnoDB: Setting file '\xampp\mysql\data\ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...
2020-11-02 20:16:23 0 [Note] InnoDB: File '\xampp\mysql\data\ibtmp1' size is now 12 MB.
2020-11-02 20:16:23 0 [Note] InnoDB: Waiting for purge to start
2020-11-02 20:16:23 0 [Note] InnoDB: 10.4.14 started; log sequence number 300556; transaction id 171
2020-11-02 20:16:23 0 [Note] InnoDB: Loading buffer pool(s) from D:\xampp\mysql\data\ib_buffer_pool
2020-11-02 20:16:23 0 [Note] Plugin 'FEEDBACK' is disabled.
2020-11-02 20:16:23 0 [Note] Server socket created on IP: '::'.

解决办法：
将xampp安装目录下的mysql/backup文件夹中的内容全部复制进入mysql/data当中，替换。