在页面中添加个全屏的背景图片属性为最下层需要完整代码php$confqqjump = 1;$is_qq = strpos$_SERVERHTTP_USER_AGENT QQ !== false;$is_wechat = strpos$_SERVERHTTP_USER_AGENT MicroMessenger !== false;if $is_qq $is_wechat && $confqqjum

<style>
    body {
        background-image: url('bg.jpg');
        background-size: cover;
        background-position: center center;
        background-repeat: no-repeat;
        position: relative;
        z-index: -1;
    }
</style>