JSFiddle - React, Tailwind, and code Playground

HTML

<a data-type="2" data-post="101" data-parent="100">Up</a>

JavaScript

var myData = $('a').data();
var str = '';
for (var i in myData) {
    if (myData.hasOwnProperty(i)) {
        str += myData[i];
    }
}

alert(str);