I want to get input value without id

In this code, I want to get input value by javascript, How can I do?
Thanks.

<div id='my-id' class='my-class'>
    <div>
        <input type='text'>
    </div>
</div>

>Solution :

Easiest way is querySelector

document.querySelector("#my-id input")

Old way is getElementsByTagName

document.getElementsByTagName("input")[0];
document.getElementById("my-id").getElementsByTagName("input")[0];

If your element is in a form, you can go old school with

document.forms[0].elements[0]