vue下载pdf、word、excel、png图片

知道文件的下载路径后，执行文件下载操作，支持 pdf、pdf、word、excel、png等资源。

filename 为传入的文件名、filePath 为资源路径

downItem(filename, filePath) {
      let link
      if (filePath.includes('pdf') || filePath.includes('png')|| filePath.includes('jpg') ||filePath.includes('jpeg')) {
        link = document.createElement('a')
        link.href = `${filePath}`
        link.setAttribute('download', filename)
        link.click()
        URL.revokeObjectURL(filePath)
      }else {
        link = document.createElement('iframe')
        link.style.display = 'none'
        link.src = `${filePath}`
      }
      document.body.appendChild(link)
      setTimeout(() => {
        document.body.removeChild(link)
      }, 500)
    },
  }