所谓的默哀功能，其实就是网站元素整个变色：从彩色变成灰白色，再加个提醒说今天是什么日，为什么需要默哀。因为我压根不想提醒，所以用到的东西也不多，只是一段很简单的检测日期变色 JS 代码：

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(function() {
    const now = new Date;
    const month = now.getMonth() + 1;
    const day = now.getDate();

    const isQingming = month === 4 && (day === 4 || day === 5);
    const isNationalMemorialDay = month === 12 && day === 13;
    const isWenchuan = month === 5 && day === 12;
    const isMarcoPoloBridge = month === 7 && day === 7;
    const isMukden = month === 9 && day === 18;
    const isMartyrsDay = month === 9 && day === 30;
    const isJapanSurrender = month === 8 && day === 15;
    const isZhouEnlaiDeath = month === 1 && day === 8;
    const isDengXiaopingDeath = month === 2 && day === 19;
    const isMaoDeath = month === 9 && day === 9;

    if (isQingming || isNationalMemorialDay || isWenchuan || isMarcoPoloBridge || isMukden || isMartyrsDay || isJapanSurrender || isMaoDeath || isZhouEnlaiDeath || isDengXiaopingDeath) {
        document.documentElement.style.filter = 'grayscale(100%)';
    }
})();

这段代码通过检测今天是否是对应日期（清明节、国家公祭日、汶川地震纪念日、七七事变纪念日、九一八事变纪念日、烈士纪念日、日本投降纪念日、毛泽东逝世纪念日、周恩来逝世纪念日、邓小平逝世纪念日）来判断网站是否需要开启默哀模式。为了保证代码能够运行，还需要编辑主题配置文件，导入这个 JS 代码：

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inject:
  head:
    # - <link rel="stylesheet" href="/xxx.css">
    - <link rel="stylesheet" href="/assets/css/fonts.css">
    - <link rel="stylesheet" href="/assets/css/svg.css">
    - <link rel="stylesheet" href="/assets/css/description.css">
  bottom:
    # - <script src="xxxx"></script>
    - <script src="/assets/js/reload.js"></script>
    - <script src="/assets/js/stroll.js"></script>
    - <script src="/assets/js/blindbox.js"></script>
    - <script src="/assets/js/fans.js"></script>
    - <script src="/assets/js/mourn.js"></script>

现在代码就生效了，剩下的就是等到时候了（其实也没必要特别等）。