index.js中設置如下內容：
const router = new Router({
routes: [
{
path: '/',
name: 'HelloWorld',
component: HelloWorld,
meta:{requireAuth:true}
},
{
path: '/login',
name: 'login',
component: Login
},
{
path: '/index',
name: 'index',
component: index,
meta:{requireAuth:true}
},
]
});
router.beforeEach((to, from, next) => {
//requireAuth對應上面每個跳轉的 meta:{requireAuth:true},
//配置上說明訪問該路徑時需要檢測是否登錄狀態
if(to.meta.requireAuth) {
//sessionStorage可直接使用，無需引入
//在登錄頁，點擊登錄按鈕後設置sessionStorage.setItem("key","value")
//通過sessionStorage.getItem("account")獲取，如果有值則是登錄狀態,無值則爲未登錄，自動跳轉到登錄頁
if(sessionStorage.getItem("account") == null) {
next('/login');
}else{
next();
}
}
else{
next();
}
});
export default router;