axios 文件下载

只用 axios 来实现：

var mp3_url = "http://other.player.nf01.sycdn.kuwo.cn/a8249eb428680c93e84d06971abba019/628c9fa9/resource/n1/57/86/2640963521.mp3"

const axios = require('axios').default;
const fs = require("fs")

axios({
    method: "get",
    url: mp3_url,
    responseType: 'stream',
})
.then((res) => {
    console.log("请求成功。。。。。")
    var w_s = fs.createWriteStream("./static/xxx.mp3")
    res.data.pipe(w_s)
}).catch((err) => {
    console.log("请求出错")
    console.log(err)
})

在 服务器路由中实现（本案例借助的是koa-router路由接口）:

 router.get('/:id/:mingcheng.mp3', async (ctx, next) => {
    console.log("请求过来的参数")
    console.log(ctx.params)
    ctx.body = await new Promise((resolve, reject) => {
        axios({
            method: "get",
            url: mp3_url,
            responseType: 'stream',
        })
            .then((res) => {
                resolve(res.data)
                // var w_s = fs.createWriteStream("./static/xxx.mp3")
                // res.data.pipe(w_s)
            }).catch((err) => {
                console.log("请求出错")
                console.log(err)
                reject(err)
            })
    })
});