由于我们在使用WordPress的时候会用到各种插件和主题，这样我们会看到很多的主题和插件都会有自带不少的JS代码，几十行JS代码也会占用前端页面的体积，我们是可以通过压缩合并JS来提高速度的。
//JS代码合并
add_action( 'wp_enqueue_scripts', 'merge_all_scripts', 9999 );
function merge_all_scripts()
{
global $wp_scripts;
/*
#1. Reorder the handles based on its dependency,
The result will be saved in the to_do property ($wp_scripts->to_do)
*/
$wp_scripts->all_deps($wp_scripts->queue);
$merged_file_location = get_stylesheet_directory() . DIRECTORY_SEPARATOR . 'merged-script.js';
$merged_script = '';
// Loop javascript files and save to $merged_script variable
foreach( $wp_scripts->to_do as $handle)
{
/*
Clean up url
*/
$src = strtok($wp_scripts->registered[$handle]->src, '?');
/**
#2. Combine javascript file.
*/
// If src is url http / https
if (strpos($src, 'http') !== false)
{
// Get our site url
$site_url = site_url();
/*
If we are on local server, then change url to relative path
*/
if (strpos($src, $site_url) !== false)
$js_file_path = str_replace($site_url, '', $src);
else
$js_file_path = $src;
/*
To be able to use file_get_contents function we need to remove slash
*/
$js_file_path = ltrim($js_file_path, '/');
}
else
{
$js_file_path = ltrim($src, '/');
}
// Check wether file exists then merge
if (file_exists($js_file_path))
{
// #3. Check for wp_localize_script
$localize = '';
if (@key_exists('data', $wp_scripts->registered[$handle]->extra)) {
$localize = $obj->extra['data'] . ';';
}
$merged_script .= $localize . file_get_contents($js_file_path) . ';';
}
}
// write the merged script into current theme directory
file_put_contents ( $merged_file_location , $merged_script);
// #4. Load the URL of merged file
wp_enqueue_script('merged-script', get_stylesheet_directory_uri() . '/merged-script.js');
// 5. Deregister handles
foreach( $wp_scripts->to_do as $handle )
{
wp_deregister_script($handle);
}
}
这里，在网上找到一段这个代码可以实现，但是有些时候会有可能导致有些功能失效，所以我们根据实际情况添加。
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