原生JavaScript 05-全选、全不选、反选
效果如下：

完整代码：

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <style>
        form {
            padding-left: 20px;
        }
    </style>
    <title>Document</title>

</head>

<body>
    <form action="">
        <p><input type="checkbox">赵四</p>
        <p><input type="checkbox">宋小宝</p>
        <p><input type="checkbox">刘能</p>
        <p><input type="checkbox">小沈阳</p>
    </form>
    <button class="btnAll">全选</button>
    <button class="btnNot">全不选</button>
    <button class="btnReverse">反选</button>
    <script>
        // 获取所有p 和 按钮
        let ipts = document.getElementsByTagName('input');
        let btnAll = document.querySelector('.btnAll');
        let btnNot = document.querySelector('.btnNot');
        let btnReverse = document.querySelector('.btnReverse');
        // 全选功能
        btnAll.addEventListener('click', function () {
            for (let i = 0; i < ipts.length; i++) {
                ipts[i].checked = true;
            }
        })

        // 全不选功能
        btnNot.addEventListener('click', function () {
            for (let i = 0; i < ipts.length; i++) {
                ipts[i].checked = false;
            }
        })

        // 反选
        btnReverse.addEventListener('click', function () {
            for (let i = 0; i < ipts.length; i++) {
                ipts[i].checked = !ipts[i].checked;
            }
        })
    </script>
</body>

</html>
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