按钮
      
  

const isDark = useDark();
function toggleTheme() {
  isDark.value = isDark.value ? false : true;
}

.theme-change {
  .switch {
    transition: all 3s;
    background: green;
  }
}
.k.switch {
  background: red;
}

// const isDark = useDark();
const isDark = ref(false);

// const isDark = useDark();
const isDark = ref(false);
function toggleTheme() {
  document.documentElement.classList.toggle('dark')
  isDark.value = isDark.value ? false : true;
}