全局判断登录是否过期代码

$.ajaxSetup({
      beforeSend(xhr, setting) {
        let token = localStorage.getItem('token');
        xhr.setRequestHeader('x-access-token', token);
      },
      complete(xhr, setting) {
        if (xhr.responseJSON.code === 401) {
          alert(xhr.responseJSON.message)
          router.go('/index')
        }
      }