//Result
<a href="data:text/vcard;charset=UTF-8,BEGIN%3AVCARD%0D%0AVERSION%3A4.0%0D%0AN%3A%3BAriel Galetto%3B%3B%3B%0D%0AFN%3AAriel Galetto%0D%0AEMAIL%3Aaga@d.com%0D%0AORG%3AAriel Galetto%0D%0ATEL%3A3515918938%0D%0ATEL%3Btype%3DFAX%3A3515918938%0D%0AURL%3Btype%3Dpref%3Awww.bbbc.om%0D%0AADR%3A%3BAagna 33%3B%3B%3B%3B%3BSpain%0D%0AEND%3AVCARD" open="contact.vcf">Download</a>

BEGIN%3AVCARD%0D%0AVERSION%3A4.0%0D%0AN%3A%3BAriel Galetto%3B%3B%3B%0D%0AFN%3AAriel Galetto%0D%0AEMAIL%3Aaga@d.com%0D%0AORG%3AAriel Galetto%0D%0ATEL%3A3515918938%0D%0ATEL%3Btype%3DFAX%3A3515918938%0D%0AURL%3Btype%3Dpref%3Awww.bbbc.om%0D%0AADR%3A%3BAagna 33%3B%3B%3B%3B%3BSpain%0D%0AEND%3AVCARD
<button id="clickMe" type="button">A</button>

<script>
var btn = document.getElementById("clickMe");
btn.addEventListener("click", loadvcard);
function loadvcard(){
 var data = "BEGIN%3AVCARD%0AVERSION%3A3.0%0AN%3ADoe%3BJohn%0AFN%3AJohn%20Doe%0ATITLE%3A08002221111%0AORG%3AStackflowover%0AEMAIL%3BTYPE%3DINTERNET%3Ajohndoe%40gmail.com%0AEND%3AVCARD";
 window.open("data:text/x-vcard;urlencoded," + data);
}
</script>