以编程方式更改组合框

const select = document.getElementById('mySelect');
const option = document.createElement('option');
option.value = 'newOption';
option.text = 'New Option';
select.add(option);

const select = document.getElementById('mySelect');
const option = document.getElementById('optionToRemove');
select.removeChild(option);

const select = document.getElementById('mySelect');
select.style.width = '200px';
select.style.height = '50px';

const select = document.getElementById('mySelect');
select.style.fontFamily = 'Arial';
select.style.color = 'red';

const select = document.getElementById('mySelect');
select.addEventListener('change', function() {
  console.log('The selected option is: ' + this.value);
});