使用vue判斷驗證用戶登錄狀態
- 導航鉤子類似於生命週期鉤子,包含路由進入前,進入後,更新時,退出前等幾個週期,主要用於控制導航的前進後退或跳轉等。
其中router.beforeEach就是路由進入前的週期,同時有路由的來源和去向兩個參數,可以判斷和控制當前路由的走向和重定向。
一般router.beforeEach配合vuex全局狀態儲存使用,驗證用戶登錄狀態。也可以結合sessionStorage 和localStorage使用,原理相同。
用戶登錄狀態驗證
路由配置
定義需要判斷登錄狀態的meta 屬性auth
const routes =[
{
path:'/',
component: resolve => require(['../components/mainTem/Filtrate.vue'],resolve),
meta:{auth:true,keepAlive: false},
name:'Filtrate'
},//首頁
{
path:'/Home',
component: resolve => require(['../components/mainTem/Home.vue'],resolve),
meta:{auth:true,keepAlive: true },
name:'Home'
},//登錄
{
path:'/Login',
component: resolve => require(['../components/mainTem/Login.vue'],resolve),
meta:{auth:true,keepAlive: false},
name:'Login'
},//最新案例
{
path:'/NewCase',
component: resolve => require(['../components/mainTem/NewCase.vue'],resolve),
meta:{auth:true,keepAlive: true},
name:'NewCase'
},//推薦
{
path:'/Recommend',
component: resolve => require(['../components/mainTem/Recommend.vue'],resolve),
meta:{auth:true,keepAlive: true},
name:'Recommend'
},//個人中心
{
path:'/User',
component: resolve => require(['../components/mainTem/User.vue'],resolve),
meta:{auth:true,keepAlive: true},
name:'User'
},//篩選
{
path:'/Filtrate',
component: resolve => require(['../components/mainTem/Filtrate.vue'],resolve),
meta:{auth:true,keepAlive: false},
name:'Filtrate'
},
{//詳情
path:'/Detail',
component: resolve => require(['../components/mainTem/Detail.vue'],resolve),
meta:{auth:true,keepAlive: false},
name:'Detail'
}
]
監聽
我用的是localStorage儲存的用戶token值。
業務邏輯:用戶沒有localStorage說明是第一次登錄,則直接跳到登錄頁面,在登錄頁面儲存token值,存在localStorage,用戶關閉頁面後,在24小時內,再次打開頁面直接進入主頁面,通過localStorage去判斷當前token是否有效,如果已失效,則提示登錄已超時,重新跳到登錄頁面。
meta
只有在路由中設置了meta auto屬性爲true的才判斷,以上路由全部由設置
to
to爲向後走的路由對象,包括路由的完整信息
from
from爲從哪跳來的路由對象
next()
next()控制路由向下走,重新定義路由跳轉的路由next(‘路由路徑)
/** 驗證用戶是否登錄 **/
router.beforeEach((to,from,next) => {
if(to.matched.some( m => m.meta.auth)) {
// console.log("先判斷是否登錄");
if(to.name=='Login'){
next();
}else{
if(localStorage.getItem('token')){
//訪問服務器緩存數據,判斷當前token是否失效
Vue.http.get("http:xxxx/Login/UserIsLogin?token="+localStorage.getItem('token')+"&url="+to.name,{withCredentials: true}).then(response => response.json()).then(num => {
// console.log('是否登錄',num);
if(num.code==1001){
next();
}else{
alert('您的token已超時,請重新登錄');
next('/Login');
}
})
}else{
next('/Login');
}
}
} else {
console.log("請先登錄");
next()
}
})