JSFiddle - React, Tailwind, and code Playground

HTML

<table>
    <tr>
        <td>Test</td>
        <td>Test2</td>
    </tr>
    <tr>
        <td>Test</td>
        <td>Test2</td>
    </tr>
    <tr>
        <td>Test</td>
        <td>Test2</td>
    </tr>
    <tr>
        <td>Test</td>
        <td>Test2</td>
    </tr>
</table>

JavaScript

var table = document.getElementsByTagName( "table" )[0];
for( var contador = 0; contador < table.getElementsByTagName( "tr" ).length; contador++ ){
var line = table.getElementsByTagName( "tr" )[contador];
line.onclick = function(){
    this.innerHTML = "Row clicked...";
};
}