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HTML

<svg class="barcode" jsbarcode-width="1" jsbarcode-height="22" jsbarcode-textalign="center" jsbarcode-textposition="bottom" jsbarcode-displayvalue="true" jsbarcode-font="monospace" jsbarcode-fontstyle="monospace" jsbarcode-fontsize="14" jsbarcode-background="#FFFFFF" jsbarcode-linecolor="#000000" jsbarcode-textmargin="5" jsbarcode-fontoptions="0 0" jsbarcode-format="code128" jsbarcode-value="0219000780318" width="143px" height="61px" x="0px" y="0px" viewBox="0 0 143 61" xmlns="http://www.w3.org/2000/svg" version="1.1" style="transform: translate(0px, 0px);">
  <rect x="0" y="0" width="143" height="61" style="fill:#FFFFFF;"></rect>
  <g transform="translate(10, 10)" style="fill:#000000;">
    <rect x="0" y="0" width="2" height="22"></rect>
    <rect x="3" y="0" width="1" height="22"></rect>
    <rect x="6" y="0" width="3" height="22"></rect>
    <rect x="11" y="0" width="2" height="22"></rect>
    <rect x="15" y="0" width="2" height="22"></rect>
    <rect x="19" y="0" width="2" height="22"></rect>
    <rect x="22" y="0" width="2" height="22"></rect>
    <rect x="26" y="0" width="1" height="22"></rect>
    <rect x="28" y="0" width="3" height="22"></rect>
    <rect x="33" y="0" width="2" height="22"></rect>
    <rect x="36" y="0" width="2" height="22"></rect>
    <rect x="40" y="0" width="2" height="22"></rect>
    <rect x="44" y="0" width="1" height="22"></rect>
    <rect x="47" y="0" width="2" height="22"></rect>
    <rect x="52" y="0" width="1" height="22"></rect>
    <rect x="55" y="0" width="1" height="22"></rect>
    <rect x="57" y="0" width="1" height="22"></rect>
    <rect x="60" y="0" width="4" height="22"></rect>
    <rect x="66" y="0" width="2" height="22"></rect>
    <rect x="69" y="0" width="2" height="22"></rect>
    <rect x="74" y="0" width="2" height="22"></rect>
    <rect x="77" y="0" width="3" height="22"></rect>
    <rect x="81" y="0" width="1" height="22"></rect>
    <rect x="83" y="0" width="4" height="22"></rect>
    <rect x="88" y="0"...

JavaScript

document.querySelector("#download").onclick = () => {
  downloadSvg(document.querySelector('.barcode').outerHTML);
}

const downloadSvg = (svg) => {
  const url = URL.createObjectURL(new Blob([svg], {
    type: 'image/svg+xml'
  }));
  const download = document.createElement('a');
  download.href = url;
  download.download = 'barcode.svg';
  download.click();
  URL.revokeObjectURL(url);
}