使用此类：http://www.deluxeblogtips.com/p/meta-box-script-for-wordpress.html

然后像这样调用metabox（不要忘记阅读手册并查看一些示例）：

$meta_boxes[] = array(
    \'id\' => \'textmetabox\',
    \'title\' => \'Your Meta Box Title\',
    \'pages\' => array(\'post\', \'slider\', \'whatever-your-cpt-is\'),

    \'fields\' => array(
        array(
            \'name\' => \'Your thoughts about Deluxe Blog Tips\',
            \'id\' => $prefix . \'thoughts\',
            \'type\' => \'wysiwyg\',
            \'std\' => \'<b>It\\\'s great!</b>\',
            \'desc\' => \'Do you think so?\',
            \'style\' => \'width: 300px; height: 400px\'
        )
    )
);