js的选择提示框

let selectElement = document.getElementById('mySelect');
let options = ['Option 1', 'Option 2', 'Option 3'];

options.forEach(function(optionText) {
    let option = document.createElement('option');
    option.text = optionText;
    selectElement.add(option);
});

let selectElement = document.getElementById('mySelect');

selectElement.addEventListener('change', function() {
    let selectedValue = this.value;
    console.log(selectedValue);
});

let option = document.createElement('option');
option.text = 'Default Option';
option.selected = true; // 设置为默认选中
selectElement.add(option);

<select id="mySelect" multiple>
    <option value="1">Option 1</option>
    <option value="2">Option 2</option>
    <option value="3">Option 3</option>
</select>

let selectedOptions = selectElement.selectedOptions;
for (let i = 0; i < selectedOptions.length; i++) {
    console.log(selectedOptions[i].text);
}