javascript - mounted后，能取到data下的数组的数据，无法取到length？

data () {
    return{
        list:[]
    }
},

methods: {
    getData() {
        this.$http.jsonp(url).then((data) => {
            data.list.map(item => this.list.push(item)
            console.log(this.list.length) // 10
        })
    }
},

created() {
    this.getData()
},

mounted() {
    console.log(this.list.length) // 0
}

怎么会这样？在mounted中打印this.list有数据

very much Thanks in advance~~~