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添加到主题 functions.php

add_action('pre_get_posts','alter_query');
function alter_query($query){
    if ($query->is_main_query() &&  is_home())
        $query->set('orderby', 'rand'); //Set the order to random
}


//Random posts from category

function wpsites_query( $query ) {
if ( $query->is_category() && $query->is_main_query() ) {
        $query->set( 'orderby', 'rand' );
    }
}
add_action( 'pre_get_posts', 'wpsites_query' );