vue+axios 实现post文件下载

思路：

1. 修改axios请求的responseType为blob

2. 创建a标签，设置download属性，插入到文档中并click

方法一：

axios.post(downloadUrl, reqData, {
  responseType: 'blob'
}).then(res => {
  let blob = res.data
  let reader = new FileReader()
  reader.readAsDataURL(blob)
  reader.onload = (e) => {
    let a = document.createElement('a')
    a.download = fileName
    a.href = e.target.result
    document.body.appendChild(a)
    a.click()
    document.body.removeChild(a)
  }
})

方法二：

axios({
    method: 'post',
    url: 'api/user/',
    data: {
        firstName: 'Fred',
        lastName: 'Flintstone'
    },
    responseType: 'blob'
}).then(response => {
    this.download(response)
}).catch((error) => {
})

methods: {
    // 下载文件
    download (data) {
        if (!data) {
            return
        }
        let url = window.URL.createObjectURL(new Blob([data]))
        let link = document.createElement('a')
        link.style.display = 'none'
        link.href = url
        link.setAttribute('download', 'excel.xlsx')
 
        document.body.appendChild(link)
        link.click()
    }
}