需求

项目需求，将通话记录下载下来，要求不跳转界面直接下载。

效果

代码

	// 下载录音
    downloadRecording(data) {
      const url = data.url
      const fileName = '录音.mp3'
      this.getOSSBlobResource(url).then(res => {
        this.saveFile(res, fileName)
      })
    },
    getOSSBlobResource(url) {
      return new Promise((resolve) => {
        const xhr = new XMLHttpRequest()
        xhr.open('GET', url, true)
        xhr.responseType = 'blob'
        xhr.setRequestHeader('Cache-Control', 'no-cache')
        xhr.onload = () => {
          if (xhr.status === 200) {
            resolve(xhr.response)
          }
        }
        xhr.send()
      })
    },
    // 保存文件
    saveFile(data, fileName) {
      const exportBlob = new Blob([data])
      const saveLink = document.createElement('a')
      document.body.appendChild(saveLink)
      saveLink.style.display = 'none'
      var urlObject = window.URL.createObjectURL(exportBlob)
      saveLink.href = urlObject
      saveLink.download = fileName
      saveLink.click()
      document.body.removeChild(saveLink)
    }
  }