//request.jsservice.interceptors.response.use((response) => {const res = response.data// 下载文件if (!res.code) {return response}...},(error) => {...}
export function downloadQrcode(params) {return request({url: '/multiplayer-draw/download-qrcode',method: 'get',// headers: { 'Content-Type': 'image/png; charset=UTF-8' }, responseType: 'blob',// response类型params})}
downloadQrcode({id: this.id}).then(res => {console.log(res,'res'); var a = document.createElement('a')document.body.appendChild(a)a.style = 'display: none'let url = window.URL.createObjectURL(res); a.href =urla.download = '二维码.png'a.click()a.remove()window.URL.revokeObjectURL(url) // 释放url})

发现报错:

同时,发现接口是有返回值的:

再看打印的res:
发现打印的res并不是最后我们需要的Blob值,我们需要的是Blob类型的值,发现正是res.data(但是从浏览器控制台并不能看出data),所以应该修改request.js为:

const res = response.data // 下载文件 if (!res.code) { return response.data //等同于 return res }

此时发现打印的res为:

也没有“TypeError: Failed to execute ‘createObjectURL’ on ‘URL’: Overload resolution failed”这个报错了,成功下载了图片。

还有第二种方法:创建一个Blob

downloadQrcode({id: this.id}).then(res => { console.log(res,'res'); var a = document.createElement('a') document.body.appendChild(a) a.style = 'display: none' //增加了下面三行 let blob = new Blob([res], { type: "image/png", });let url = window.URL.createObjectURL(blob);a.href =url a.download = '二维码' a.click() a.remove() window.URL.revokeObjectURL(url) // 释放url })

发现打印的res没变

但是也没有出现“TypeError: Failed to execute ‘createObjectURL’ on ‘URL’: Overload resolution failed”报错,而且a.download = ‘二维码.png’变成了a.download = ‘二维码’,也成功下载了图片。