我目前正在開(kāi)發(fā)一個(gè)網(wǎng)站，在這里可以檢索團(tuán)隊(duì)信息：export default class TeamInfo extends React.Component{        constructor(props) {        super(props);             this.state = {          isShow: true,          team: []        };        this.getTeam();      }        getTeam(){        const axios = require("axios");        const team_id = this.props.id;        axios.get(API+'/team/'+ team_id).then(res => {            this.setState({team : res.data})            console.log('inside teaminfo... ' + this.state.team.location.city);        })    } render() {        return(         <div><h1>{this.state.team.location.city}</h1></div>)}}這是團(tuán)隊(duì) JSON 答案的結(jié)構(gòu)：{    "name": "Barcelona",    "shield": "shield.png",    "location": {        "city": "Barcelona",        "country": "SPAIN"    },    "score": 74626,}我正在嘗試訪問(wèn)團(tuán)隊(duì)位置 this.state.team.location.city ，因?yàn)楫?dāng)我在控制臺(tái)中登錄時(shí)它顯示正確，但Unhandled Rejection (TypeError): Cannot read property 'city' of undefined顯示在網(wǎng)站中。任何提示或幫助將不勝感激。