菜鸟教程在线编辑器

左右布局

AI 编程工具

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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>菜鸟教程(runoob.com)</title>
<script>
function getOptions(){
    var x=document.getElementById("mySelect");
    var txt="选中的选项是: ";
    var i;
    for (i=0;i<x.length;i++){
        if(x.options[i].selected) {
            txt=txt + "\n" + x.options[i].text;
        }