文件流下载

vue项目，后端返文件流来下载
封装通用方法：

export function download(url, params, filename, type, contentType) {
  return service.post(url, params, {
    headers:{ 'Content-Type': contentType},
    responseType: 'blob'
  }).then((data) => {
    const content = data
    let blob = null
    if (type) {
    	blob = new Blob([content], {type})
    } else {
    	blob = new Blob([content])
    }
    
    if ('download' in document.createElement('a')) {
      const elink = document.createElement('a')
      elink.download = filename
      elink.style.display = 'none'
      elink.href = URL.createObjectURL(blob)
      document.body.appendChild(elink)
      elink.click()
      URL.revokeObjectURL(elink.href)
      document.body.removeChild(elink)
    } else {
      navigator.msSaveBlob(blob, filename)
    }
  }).catch((r) => {
    console.error(r)
  })
}

1. 导出zip格式
   idList： 数组id

download(url,idList, `某某.zip`,'application/zip','application/json; application/octet-stream').then( res => {
            this.loading = false
            this.ids = []
            // this.$refs.multipleTable.clearSelection()
  })

2. 导出excel

download(url,idList, `某某.excel`,null,'application/x-www-form-urlencoded').then( res => {})