利用路由守卫实现token过期后返回登录界面

const timeX = localStorage.getItem("time");
//如果有时间戳存在会判断token是否过期
if(timeX!==null){
    const time=timeX.slice(1,-1)//获取了token的过期时间
    const tokenTime=new Date(time);

    const currentTimeUS=new Date();
    const currentTimeCN=new Date(currentTimeUS.getTime()+8*60*60*1000)

    if(currentTimeCN>tokenTime&& to.path !== '/login' && to.path !== '/register'){
        localStorage.removeItem("user")
        localStorage.removeItem("time")
        return next('/login')
    }

//在登录的时候往localstorage中塞一个date
const currentDate=new Date();
const tokenUselessDate=new Date(currentDate.getTime()+10*60*60*1000);
localStorage.setItem("time",JSON.stringify(tokenUselessDate));