~~~ <keep-alive> <router-view></router-view> </keep-alive> ~~~ >[info]使用keep-alive优化性能,加载过的数据直接放在缓存中,不会重新去加载ajax 只要使用keep-alive会触发activated生命周期函数 ~~~ activated(){ /* 判断当前城市和之前城市是否一样,不一样则发送ajax */ if(this.city != this.lastCity){ this.lastCity= this.city; this.getHomeInfo() } } ~~~