Capture enter on input (Pure JavaScript)

Capture the enter key on input using pure JavaScript

HTML

<input id="input" type="text" placeholder="Enter captured here">
<input id="input2" type="text" placeholder="Enter not captured here">

JavaScript

var myInput = document.getElementById("input");


$(document).keyup(function(event) {
    if ($("#input").is(":focus") && event.key == "Enter") {
       alert('Branko');
    }
});