前端：点击文件链接时，想要直接预览而不是下载

function reeFile (url) {
        let onlineViewType = ['doc', 'docx', 'xls', 'xlsx', 'xlsm', 'ppt', 'pptx']
        let fileTypeName = url.substring(url.lastIndexOf('.') + 1, url.length).split('?')[0]
        let isWord = onlineViewType.find((type) => type === fileTypeName)
        if (isWord) {
            url =
          'http://www.pfile.com.cn/api/profile/onlinePreview?url=' +
          encodeURIComponent(url)
        }
        window.open(url, '_blank')
    }