vue.js用select实现省，市，提交后，默认显示省，市信息

<select v-model="citys" name="cityVal" @change="schoolName(citys)">
        <option v-for="(item,index) in city" :value="item.val" v-text="item.name" ></option>
</select>

<select v-model="schools" name="schoolVal">
         <option v-for="(item,index) in school" :value="item.val" v-text="item.name" ></option>
 </select>

<script>
    var vue = new Vue({
        el: '#body',
        data: function() {
            return {
                city: [{
                    val: '',
                    name: '城市'
                }],
                citys: ,
                school: [{
                    val: '',
                    name: '高校'
                }],
                schools: ,
                schoolAjax:''
            }
        },
        methods: {
            cityName: function() {
                var this_obj = this;
                $.ajax({
                    type: "post",
                    url: $app+"/Clan/city",
                    dataType: "json",
                    success: function(res) {
                        if(res.status) {
                            $.each(res.info,function(k, v) {
                                this_obj.city.push({
                                    name:v.ar_name,
                                    val:v.ar_id,
                                })
                            })

                        } else {

                        }
                    },
                    error: function() {
                        $.alert({
                            msg: '传输错误1'
                        })
                    }
                });
            },
            schoolName: function(citys) {
                var this_obj = this;
                var data = { ar_id:citys};
                $.ajax({
                    type: "post",
                    data:data,
                    url: $app+"/Clan/school",
                    dataType: "json",
                    success: function(res) {
                        this_obj.school=[{ val: '',name: '高校'}]
                        if(res.status) {
                            $.each(res.info,function(k, v) {
                                this_obj.school.push({
                                    val:v.sc_id,
                                    name:v.sc_name
                                })
                            });
                                this_obj.schools=this_obj.schoolAjax;
                        } else {

                    },
                    error: function() {
                        $.alert({
                            msg: '传输错误7'
                        })
                    }
                });
            },
            defules:function(){
                var this_obj = this;
                $.ajax({
                    type: "post",
                    url: $app+"/Call/team_user",
                    dataType: "json",
                    success: function(res) {
                        console.log(res.info);
                        if(res.status) {

                                this_obj.schoolName(res.info.us_arid);
                                this_obj.schoolAjax=res.info.us_scid;                    

                        } else {

                        }
                    },
                    error: function() {
                        $.alert({
                            msg: '传输错误5'
                        })
                    }
                });
            }
            }
    })    

    vue.cityName();
    vue.defules();