hugo-theme-hello-friend/source/js/theme.js

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JavaScript
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// Toggle theme
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const getTheme = window.localStorage && window.localStorage.getItem("theme");
const themeToggle = document.querySelector(".theme-toggle");
const isDark = getTheme === "dark";
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if (getTheme !== null) {
document.body.classList.toggle("dark-theme", isDark);
}
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themeToggle.addEventListener("click", () => {
document.body.classList.toggle("dark-theme");
window.localStorage &&
window.localStorage.setItem(
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"theme",
document.body.classList.contains("dark-theme") ? "dark" : "light",
);
});