<script>import axios from 'axios'import qs from 'qs'export default {  methods: {    request(keyword) {      var CancelToken = axios.CancelToken      var source = CancelToken.source()             // 取消上一次請求      this.cancelRequest();            axios.post(url, qs.stringify({kw:keyword}), {        headers: {          'Content-Type': 'application/x-www-form-urlencoded',          'Accept': 'application/json'        },        cancelToken: new axios.CancelToken(function executor(c) {          that.source = c;        })      }).then((res) => {        // 在這里處理得到的數據        ...      }).catch((err) => {        if (axios.isCancel(err)) {          console.log('Rquest canceled', err.message); //請求如果被取消，這里是返回取消的message        } else {          //handle error          console.log(err);        }      })    },    cancelRequest(){      if(typeof this.source ==='function'){        this.source('終止請求')      }    },  }}</script>