vue路由监听

<template>
<div>
    <keep-alive>
        <router-view/>
        </keep-alive>
    </div>
    
</template>
<script>
    export default{
        created() {
            //this.$router.push("/hw")
            },
            watch:{
                $route(to,from){//注意：监听代码必须放在<router-view/>页面中才起作用
                    alert(to.path)
                    alert(from.path)
                }
            }
        
    }
</script>