如何在vue.js中使用axios实现下载功能

import axios from 'axios'
// download url
const downloadUrl = url => {
 let iframe = document.createElement('iframe')
 iframe.style.display = 'none'
 iframe.src = url
 iframe.onload = function () {
 document.body.removeChild(iframe)
 }
 document.body.appendChild(iframe)
}
// Add a response interceptor
axios.interceptors.response.use(c=> {
 // 处理excel文件
 if (res.headers && (res.headers['content-type'] === 'application/x-msdownload' || res.headers['content-type'] === 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet')) {
 downloadUrl(res.request.responseURL)
 
 <span style="color:#ff0000;"> res.data='';
 res.headers['content-type'] = 'text/json'
 return res;</span>
 }
 ...
 return res;
}, error => {
 <span style="color:#ff0000;">// Do something with response error
 return Promise.reject(error.response.data || error.message)</span>
})
export default axios