js获取到listbox所有的值

// 假设ListBox的id为'myListBox'
const listBox = document.getElementById('myListBox');
const values = Array.from(listBox.options).map(option => option.value);

console.log(values); // 输出所有选项的值

const listBox = document.getElementById('myListBox');
const values = [];

for (let i = 0; i < listBox.options.length; i++) {
    values.push(listBox.options[i].value);
}

console.log(values); // 输出所有选项的值

window.onload = function() {
    const listBox = document.getElementById('myListBox');
    if (listBox) {
        const values = Array.from(listBox.options).map(option => option.value);
        console.log(values);
    } else {
        console.error('ListBox not found!');
    }
};