watch: {
? ? $route(to, from) {
? ? ? console.log(to);
? ? ? if (to.path == '/main/home') {
? ? ? ? this.actived = 0
? ? ? } else if (to.path == '/main/lesson') {
? ? ? ? this.actived = 1
? ? ? } else if (to.path == '/main/my') {
? ? ? ? this.actived = 2
? ? ? }
? ? }
? },
