如何使用javascript更改listbox中元素的顺序并将listbox的值存储到数组中

var listBox = document.getElementById("myListbox");

var selectedOptions = [];
for (var i = 0; i < listBox.selectedOptions.length; i++) {
    selectedOptions.push(listBox.selectedOptions[i].value);
}

listBox.innerHTML = "";
for (var i = 0; i < selectedOptions.length; i++) {
    var option = document.createElement("option");
    option.value = selectedOptions[i];
    option.text = selectedOptions[i];
    listBox.appendChild(option);
}

var listBox = document.getElementById("myListbox");

var selectedOptions = [];
for (var i = 0; i < listBox.selectedOptions.length; i++) {
    selectedOptions.push(listBox.selectedOptions[i].value);
}

// 更改元素的顺序
selectedOptions.reverse();

// 更新listbox的顺序
listBox.innerHTML = "";
for (var i = 0; i < selectedOptions.length; i++) {
    var option = document.createElement("option");
    option.value = selectedOptions[i];
    option.text = selectedOptions[i];
    listBox.appendChild(option);
}