js如何把值赋给input

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

document.getElementById('myInput').value = '新的值';

<div class="container">
  <input type="text" class="myInput">
</div>

document.querySelector('.container .myInput').value = '新的值';

<input type="text" id="myInput">
<button id="myButton">设置值</button>

document.getElementById('myButton').addEventListener('click', function() {
  document.getElementById('myInput').value = '新的值';
});

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

$('#myInput').val('新的值');

window.onload = function() {
  document.getElementById('myInput').value = '新的值';
};

document.getElementById('myForm').reset();