// wordpress后台 HTML 编辑器添加自定义快捷标签按钮
 add_action('after_wp_tiny_mce', 'lxtx_bolo_after_wp_tiny_mce');
 function lxtx_bolo_after_wp_tiny_mce($mce_settings) {
    ?>
    <script type="text/javascript">    
    QTags.addButton( 'youkushipinjm', '视频', 
    '<p class="wa-video"><iframe src="视频地址" frameborder="0" allowfullscreen="allowfullscreen"></iframe></p>n', "" );  
 
    </script>
    <?php 
}

/*视频自适应代码*/
.wa-video {
    position:relative;
    padding-bottom:56.25%;
    height:0;
    overflow:hidden;
}
.wa-video iframe,.wa-video object,.wa-video embed {
    position:absolute;
    top:0;
    left:0;
    width:100%;
    height:100%;
}