match password and confirm password in javascript if true then submit form

1function onChange() {
2  const password = document.querySelector('input[name=password]');
3  const confirm = document.querySelector('input[name=confirm]');
4  if (confirm.value === password.value) {
5    confirm.setCustomValidity('');
6  } else {
7    confirm.setCustomValidity('Passwords do not match');
8  }
9}

1var check = function() {
2  if (document.getElementById('password').value ==
3    document.getElementById('confirm_password').value) {
4    document.getElementById('message').style.color = 'green';
5    document.getElementById('message').innerHTML = 'matching';
6  } else {
7    document.getElementById('message').style.color = 'red';
8    document.getElementById('message').innerHTML = 'not matching';
9  }
10}

1<form>
2  <label>Password: <input name="password" type="password" onChange="onChange()" /> </label><br />
3  <label>Confirm : <input name="confirm"  type="password" onChange="onChange()" /> </label><br />
4  <input type="submit" />
5</form>