js post下载文件 后端返回文件流

// 导出excel
handleExport = () => {
const data = { ...this.state };
data.keyword = this.keyword;
Post({ url: "/projectInfo/exportProjectInfoList", data: data, type: "upload", responseType: "blob" }).then(res => {
if (res.size != 88) {
const content = res
const blob = new Blob([content])
const fileName = '项目信息表.xls'
if ('download' in document.createElement('a')) { // 非IE下载
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) // 释放URL 对象
document.body.removeChild(elink)
} else {
navigator.msSaveBlob(blob, fileName)
}
} else {
message.error("该账号无导出项目权限", 0.5)
}

})
}