生命周期执行顺序：
1、不使用keep-alive的情况：beforeRouteEnter --> created --> mounted --> destroyed
2、使用keep-alive的情况：beforeRouteEnter --> created --> mounted --> activated --> deactivated
3、使用keep-alive，并且再次进入了缓存页面的情况：beforeRouteEnter -->activated --> deactivated
在keep-alive页面里的activated 监听路由的参数变化可以实现全页面刷新，
"$route.query.type": function name(paidrams) {
if (this.$route.path === "当前的路径") {
console.log("上次id", this.policyId, "本次id", this.$route.query.id);
if (this.policyId != this.$route.query.id||this.pageType!= this.$route.query.type) {
console.log("路由参变化");
this.getDetail();
}
}
},
$route: {
handler: function (val, oldVal) {
if (val.path === "当前的路径") {
console.log("监听路由变化", val, oldVal);
}
}
}
