如何使用Node.JS中的NPM qr代码模块下载qr代码？

Question

我正在获取DataUrl，现在如何以图像格式下载？

我正在获取以下字符串：

  

数据：图像/ PNG; BASE64，iVBORw0KGgoAAAANSUhEUgAAAIQAAACECAYAAABRRIOnAAAAAklEQVR4AewaftIAAAONSURBVO3BQY4jRwADwWRB // 9yeg4 + 8FRAQ9J412BE / MHMvw4z5TBTDjPlMFMOM + UwUw4z5TBTDjPlMFMOM + UwUw4z5TBTDjPlxZuS8JtUWhKaSkvCjcoTSbhRaUn4TSrvOMyUw0w5zJQXH6bySUn4piQ0lW9S + aQkfNJhphxmymGmvPiyJDyh8oRKS0JTaUm4ScITKu9IwhMq33SYKYeZcpgpL / 5ySbhJwhMqLQlN5f / sMFMOM + UwU178z6i0JDSVloSWhCeS0FT + ZoeZcpgph5ny4stU / mQqLQlN5ZtU / iSHmXKYKYeZ8uLDkvA3SUJTaUloKu9Iwp / sMFMOM + UwU168SeW / pPJJSWgqLQlN5Ublb3KYKYeZcpgp8Qe / KAlN5SYJTeUmCe9QeSIJTeUmCU + otCTcqLzjMFMOM + UwU158WRKaSktCU2kqLQk3Ki0JTyThRuUdKjdJuFH5psNMOcyUw0yJP / hFSWgqN0loKi0JNyotCU3liSQ0lSeS0FRukvCEyjsOM + UwUw4zJf7gDUm4UXkiCU3lJgm / SeWTkvCEyjcdZsphphxmSvzBByXhRqUl4ZNUbpLQVG6ScKNyk4QnVG6ScKPyjsNMOcyUw0x58WEqLQlPqDyRhJsk3CShqTyRhBuVloSm0pJwo / JNh5lymCmHmfLiTUloKk2lJaGptCQ8oXKj8kkq71D5kx1mymGmHGZK / MEHJeFG5R1JaCrvSMI7VFoSblRaEprKTRKayicdZsphphxmyos3JeFG5SYJTaUl4Ykk3Kg0lZaEG5WWhCeScJOEpvKbDjPlMFMOMyX + 4C + WhKbSknCjcpOEJ1SeSMKNSktCU / mkw0w5zJTDTHnxpiT8JpWm0pJwo9KS8IRKS8JNEprKjUpLQlP5psNMOcyUw0x 58WEqn5SEJ1RaEm5UbpLwDpUnkvBEEprKOw4z5TBTDjPlxZcl4QmVb0rCjUpTaUm4ScI3JeGbDjPlMFMOM + XFXy4JTaWptCTcJKGpPKHSknCj0pLQVFoSmsonHWbKYaYcZsqLv5zKO1RaEloSvikJTeVGpSWhqbzjMFMOM + UwU158mcp / KQlPqHySSkvCTRKaym86zJTDTDnMlBcfloT / UhLekYSmcpOEd6i0JLQkNJVvOsyUw0w5zJT4g5l / HWbKYaYcZsphphxmymGmHGbKYaYcZsphphxmymGmHGbKYaYcZso / Z1eSDRZlz6EAAAAASUVORK5CYII =

var segs = [
    { data: 'ABCDEFG', mode: 'alphanumeric' },
    { data: '0123456', mode: 'numeric' }
]
QRCode.toDataURL(segs, { errorCorrectionLevel: 'H', version:2 }, 
    function (err, url) {
        // QRCode.pipe(url);
        console.log(url)
});

我已将字符串发送到：

<img src="data:image/png;base64,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" alt="qrcode">

是的，它适用于视觉效果，但我想以png或jpeg格式下载它。