通过css变量来控制，再结合localstorage来实现主题刷新留存效果，代码如下：
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width,initial-scale=1.0,maximum=1.0,minimum=1.0,user-scalable=0" />
<style>
:root {
--background-color: #fff;
--text-color: #121416d8;
--link-color: #543fd7;
}
html[data-theme='light'] {
--background-color: #fff;
--text-color: #121416d8;
--link-color: #543fd7;
}
html[data-theme='dark'] {
--background-color: #212a2e;
--text-color: #F7F8F8;
--link-color: #828fff;
}
body {
background: var(--background-color);
color: var(--text-color);
}
a {
color: var(--link-color);
}
a:hover {
text-decoration: underline;
filter: brightness(80%);
}
</style>
</head>
<body>
<div id="theme-toggle">
<a>点击切换皮肤</a>
</div>
<script type="text/javascript">
var toggle = document.getElementById("theme-toggle");
var storedTheme = localStorage.getItem('theme') || (window.matchMedia("(prefers-color-scheme: dark)").matches ? "dark" : "light");
if (storedTheme)
document.documentElement.setAttribute('data-theme', storedTheme)
toggle.onclick = function() {
var currentTheme = document.documentElement.getAttribute("data-theme");
var targetTheme = "light";
if (currentTheme === "light") {
targetTheme = "dark";
}
document.documentElement.setAttribute('data-theme', targetTheme)
localStorage.setItem('theme', targetTheme);
};
</script>
</body>
</html>
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