text: 
  const user = {
      state: {},
      mutations: {
          logout (state, vm) {
            sessionStorage.removeItem('user');
            sessionStorage.removeItem('password');
            sessionStorage.removeItem('token');
              // 恢复默认样式
             /* let themeLink = document.querySelector('link[name="theme"]');
              themeLink.setAttribute('href', '');
              // 清空打开的页面等数据，但是保存主题数据
              let theme = '';
              if (localStorage.theme) {
                  theme = localStorage.theme;
              }*/
              localStorage.clear();
             /* if (theme) {
                  localStorage.theme = theme;
              }*/
          }
      }
  };
  
  export default user;
  