How to get the value of the input box that has gained focus

how to get the value of the input box that has gained focus

know that the input box has got the focus, how to get the value of the input box through its focus

Javascript
Apr.23,2021 
<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>

<body>
    <input type="text" value="12">
    <input type="text" value="34">
    <button></button>
</body>
<script>
    window.onload = function () {
        let input = document.getElementsByTagName('input');
        for (let i = 0; i < input.length; iPP) {
            input[i].addEventListener('focus', (e) => {
                console.log(e.target.value);
            })
        }
    }
</script>

</html>

if it is the value, upstairs after the focus event is triggered, the answer should be all yes. If you just need an input value of focus, then the following code should be able to (written by jquery) 

$('input:focus').val()

get yourself through this within the method
get the value this.value

you can get

through event.target.value in the focus event.

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