js获取input元素的值

<input type="text" id="myInput">

let inputValue = document.getElementById('myInput').value;
console.log(inputValue);

<input type="text" class="myInputClass">

let inputValue = document.querySelector('.myInputClass').value;
console.log(inputValue);

<input type="text" id="dynamicInput">

document.getElementById('dynamicInput').addEventListener('input', function(event) {
    console.log(event.target.value);
});

window.onload = function() {
    let inputValue = document.getElementById('myInput').value;
    console.log(inputValue);
};

document.addEventListener('DOMContentLoaded', function() {
    let inputValue = document.getElementById('myInput').value;
    console.log(inputValue);
});