在Wordpress根目录下的.htaccess文件内最后面，添加如下代码即可启用Gzip压缩功能。
<IfModule mod_expires.c>
ExpiresActive On
ExpiresByType image/gif A2592000
ExpiresByType image/jpeg A2592000
ExpiresByType image/png A2592000
ExpiresByType image/x-icon A2592000
ExpiresByType application/x-javascript A604800
ExpiresByType text/css A604800
</IfModule>
<IfModule mod_deflate.c>
SetOutputFilter DEFLATE
AddOutputFilterByType DEFLATE text/html text/css image/gif image/jpeg image/png application/x-javascript
</IfModule>