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[JavaScript]原生JS实现复选框的全选与反选

效果

<!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">
    <title>Document</title>
</head>

<body>
    <table>
        <thead>
            <input type="checkbox" name="" id="head">头
        </thead>
        <tbody>
            <tr>
                <td>
                    <input type="checkbox" name="" id="">1
                </td>

            </tr>
            <tr>
                <td>
                    <input type="checkbox" name="" id="">2
                </td>
            </tr>
            <tr>
                <td>
                    <input type="checkbox" name="" id="">3
                </td>
            </tr>
            <tr>
                <td>
                    <input type="checkbox" name="" id="">4
                </td>
            </tr>
            <tr>
                <td>
                    <input type="checkbox" name="" id="">5
                </td>
            </tr>
        </tbody>
    </table>
    <script>
        var chkHead = document.getElementById("head");
        var chkbox = document.getElementsByTagName("tbody")[0].getElementsByTagName("input");
        chkHead.onclick = function() {
            //全选
            for (var i = 0; i < chkbox.length; i++) {
                chkbox[i].checked = this.checked;
            }
        }
        for (var i = 0; i < chkbox.length; i++) {
            chkbox[i].onclick = function() {
                for (var i = 0; i < chkbox.length; i++) {
                    //只要有一个不是选中的状态,全选按钮就设为false
                    if (chkbox[i].checked != true) {
                        chkHead.checked = false;
                        break;
                    }
                    //如无以上情况,全选按钮维持选中状态
                    chkHead.checked = true;
                }
            }
        }
    </script>
</body>

</html>
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