JS操作select

基本操作

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
</head>
<body>
    <script>
    // 创建select
    function createSelect() {
        var mySelect = document.createElement("select");
        mySelect.id = 'mySelect';
        document.body.appendChild(mySelect);
    }
    createSelect();

    // 添加option
    function addOption() {
        var objSelect = document.querySelector("#mySelect");
        objSelect.add(new Option("文本1", "值1"));// ie
        objSelect.options.add(new Option("文本2", "值2"));// 文本是展示出来的内容
    }
    addOption();

    // 删除所有option
    function removeAllOption() {
        var objSelect = document.querySelector("#mySelect");
        objSelect.options.length = 0;
    }
    // removeAllOption();

    // 删除当前的option
    function removeNow() {
        var objSelect = document.querySelector("#mySelect");
        var index = objSelect.selectedIndex;
        objSelect.options.remove(index);
    }
    removeNow();

    // 获取当前option的内容
    function getNow() {
        var objSelect = document.querySelector("#mySelect");
        var index = objSelect.selectedIndex;
        var nowVal = objSelect.options[index].value;// objSelect.options[index].text
        console.log(nowVal);// 值2
    }
    getNow();

    // 修改当前option
    function modifyOption() {
        var objSelect = document.querySelector("#mySelect");
        var index = objSelect.selectedIndex;
        objSelect.options[index]=new Option("新修改的","new");
    }
    modifyOption();

    // 删除select
    function removeSelect() {
        var objSelect = document.querySelector("#mySelect");
        objSelect.parentNode.removeChild(objSelect);
    }
    removeSelect();
    </script>
</body>
</html>
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原文地址：https://www.cnblogs.com/jiujiaoyangkang/p/6797315.html