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我可以使用 JavaScript 切换暗模式吗？

我正在使用prefers-color-scheme: darkCSS 创建一个深色主题（它适用于macOS v10.14 (Mojave) 中的Safari ）。有没有办法强制页面在其他不支持它的浏览器上使用我的暗模式代码，如下所示？


document.querySelector('#toggleDarkMode').addEventListener('click', function () {

    -- Force page to use dark mode defined in CSS

})


萧十郎
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3回答

开满天机

不。解决方法是将更改为自定义属性的每个属性移动。然后你可以做这样的事情：p {    color: var(--body-colour);}并将其与：/* default, light scheme */body {    --body-colour: black;}@media (prefers-color-scheme: dark) {    body {        --body-colour: white;    }}body.light-mode {    --body-colour: black;}body.dark-mode {    --body-colour: white;}然后你的 JavaScript 只需要向body 元素添加一个light-mode或dark-mode类来强制使用该模式（覆盖默认值（如果浏览器不支持该功能，或者它被设置为亮模式）或暗模式媒体版本）。
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沧海一幻觉

我猜您正在使用媒体查询来了解浏览器/操作系统是否设置为暗模式。如果较旧的浏览器不理解媒体查询，他们将一起跳过它。这通常用于制作特定于浏览器的“黑客”。使其工作的一种方法是在可以添加到<body>标签的通用类中的查询之外设置 sass 代码。您可以将此预设存储在 localStorage 或 cookie 中，这样它就不会在页面重置时重置。关于 localStorage：https&nbsp;:&nbsp;//developer.mozilla.org/en-US/docs/Web/API/Window/localStorage我会让当前的 sass 代码成为一个 mixin，这样你就不需要第二次声明它并使你的代码更容易维护。有关它的更多信息：https&nbsp;:&nbsp;//sass-lang.com/documentation/at-rules/mixin
0

墨色风雨

您可以使用此代码<!doctype html><html><head>&nbsp; &nbsp; <meta charset="utf-8">&nbsp; &nbsp; <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">&nbsp; &nbsp; <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous">&nbsp; &nbsp; <title>Dark & Light Mode</title>&nbsp; &nbsp; <link rel="stylesheet" href="style.css">&nbsp; &nbsp; <style type="text/css">&nbsp; &nbsp; &nbsp; &nbsp; @import url("https://fonts.googleapis.com/css?family=Fredoka+One&display=swap");&nbsp; &nbsp; &nbsp; &nbsp; html {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; background: var(--backg);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; --btn: #2ab1ce;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; --backg: #fff;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; --colorx: #232323;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; width: 100%;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; height: 100vh;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; display: flex;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; flex-direction: column;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; justify-content: center;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; align-items: center;&nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; html[data-theme='dartheme'] {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; background: var(--backg);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; --btn: #ea4b3c;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; --backg: #232323;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; --colorx: #fff;&nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; h1 {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; font-family: 'Fredoka One', cursive;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; font-weight: 300;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; color: var(--colorx);&nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; h2 {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; font-family: 'Fredoka One', cursive;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; font-weight: 100;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; color: var(--colorx);&nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; input[type=checkbox] {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; visibility: hidden;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; height: 0;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; width: 0;&nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; label {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; margin: 0 auto;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; display: flex;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; justify-content: center;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; align-items: center;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; border-radius: 100px;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; position: relative;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; cursor: pointer;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; text-indent: -9999px;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; width: 55px;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; height: 30px;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; background: var(--btn);&nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; label:after {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; border-radius: 50%;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; position: absolute;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; content: '';&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; background: #fff;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; width: 20px;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; height: 20px;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; top: 5px;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; left: 4px;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; transition: ease-in-out 200ms;&nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; input:checked + label {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; background: #ea4b3c;&nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; input:checked + label:after {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; left: calc(100% - 5px);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; transform: translateX(-100%);&nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; html.transition,&nbsp; &nbsp; &nbsp; &nbsp; html.transition *,&nbsp; &nbsp; &nbsp; &nbsp; html.transition *:before,&nbsp; &nbsp; &nbsp; &nbsp; html.transition *:after {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; transition: ease-in-out 200ms !important;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; transition-delay: 0 !important;&nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; </style></head><body>&nbsp; &nbsp; <div class="container">&nbsp; &nbsp; &nbsp; &nbsp; <h1>Light & Dark Mode</h1>&nbsp; &nbsp; &nbsp; &nbsp; <h2>Demo</h2>&nbsp; &nbsp; &nbsp; &nbsp; <input class="container_toggle" type="checkbox" id="switch" name="mode">&nbsp; &nbsp; &nbsp; &nbsp; <label for="switch">Toggle</label>&nbsp; &nbsp; </div>&nbsp; &nbsp; <script src="function.js"></script>&nbsp; &nbsp; <script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>&nbsp; &nbsp; <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js" integrity="sha384-UO2eT0CpHqdSJQ6hJty5KVphtPhzWj9WO1clHTMGa3JDZwrnQq4sF86dIHNDz0W1" crossorigin="anonymous"></script>&nbsp; &nbsp; <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js" integrity="sha384-JjSmVgyd0p3pXB1rRibZUAYoIIy6OrQ6VrjIEaFf/nJGzIxFDsf4x0xIM+B07jRM" crossorigin="anonymous"></script>&nbsp; &nbsp; <script type="text/javascript">&nbsp; &nbsp; &nbsp;var checkbox = document.querySelector('input[name=mode]');&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; checkbox.addEventListener('change', function() {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; if(this.checked) {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; trans()&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; document.documentElement.setAttribute('data-theme', 'dartheme')&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; } else {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; trans()&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; document.documentElement.setAttribute('data-theme', 'lighttheme')&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; })&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; let trans = () => {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; document.documentElement.classList.add('transition');&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; window.setTimeout(() => {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; document.documentElement.classList.remove('transition');&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }, 1000)&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; </script></body></html>
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