我的主题是puock-2.7.10，其他的主题应该也差不多，出现这种问题时
Warning: touch(): Utime failed: Permission denied in /www/wwwroot/jiuliang/wp-content/themes/wordpress-theme-puock-2.7.10/timthumb.php on line 219
A TimThumb error has occured
The following error(s) occured:
- Could not create the index.html file - to fix this create an empty file named index.html file in the cache directory.
Query String : w=280&h=160&a=c&zc=1&q=90&src=http://jiuliang/wp-content/themes/wordpress-theme-puock-2.7.10/assets/img/random/1.jpg
TimThumb version : 2.8.14
解决方法：
把主题中的cache缓存目录改成777权限，我的是bt面板所以直接改
命令行可以：
chmod 777 cache
完美解决
