RuoYi-Vue3/src/utils/dynamicTitle.js

import store from '@/store'
import defaultSettings from '@/settings'

/**
 * 动态修改标题
 */
export function useDynamicTitle() {
  if (store.state.settings.dynamicTitle) {
    document.title = store.state.settings.title + ' - ' + defaultSettings.title;
  } else {
    document.title = defaultSettings.title;
  }
}