downloadFile = (url) => {
    
    
		// window.location.href = url;
        let elemIF = document.createElement('iframe');
        elemIF.src = url;
        elemIF.style.display = 'none';
        document.body.appendChild(elemIF);
    } 
    
<Button onClick={
    
    this.downloadFile.bind(this, '一个excel文件url地址')} >下载</Button>