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1.配置路由
{
path: '/hellow',
name:"hellow",
component: hellow,
meta:{title:"hellow"}
}
2，在mount里面賦值
mounted(){
this.title=this.$route.matched;
},
3，由於在頁面上刷新才可以顯示，所一需要watch監聽
watch: {
'$route.matched': function (newVal, oldVal) {
this.title=this.$route.matched;
}
},
3.0的監聽watch(()=>root.$route,(to,from)=>{
state.title=to.matched;
})
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