标签的全选和反选

直接上代码：
<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title></title>
    <style>
        * {
padding: 0;
            margin: 0;
        }

        .wrap {
width: 300px;
            margin: 100px auto 0;
        }

table {
border-collapse: collapse;
            border-spacing: 0;
            border: 1px solid #c0c0c0;
            width: 300px;
        }

th,
        td {
border: 1px solid #d0d0d0;
            color: #404060;
            padding: 10px;
        }

th {
background-color: #09c;
            font: bold 16px "微软雅黑";
            color: #fff;
        }

td {
font: 14px "微软雅黑";
        }

tbody tr {
background-color: #f0f0f0;
        }

tbody tr:hover {
cursor: pointer;
            background-color: #fafafa;
        }
</style>
</head>
<body>
<input type="button" id="btn1" value="全选"/>
<input type="button" id="btn2" value="清空"/>
<input type="button" id="btn3" value="反选"/>

<div class="wrap">
    <table>
        <thead>
        <tr>
            <th>
                <input type="checkbox" id="j_cbAll"/>
            </th>
            <th>菜名</th>
            <th>饭店</th>
        </tr>
        </thead>
        <tbody id="j_tb">
        <tr>
            <td>
                <input type="checkbox"/>
            </td>
            <td>红烧肉</td>
            <td>田老师</td>
        </tr>
        <tr>
            <td>
                <input type="checkbox"/>
            </td>
            <td>西红柿鸡蛋</td>
            <td>田老师</td>
        </tr>
        <tr>
            <td>
                <input type="checkbox"/>
            </td>
            <td>红烧狮子头</td>
            <td>田老师</td>
        </tr>
        <tr>
            <td>
                <input type="checkbox"/>
            </td>
            <td>日式肥牛</td>
            <td>田老师</td>
        </tr>
        </tbody>
    </table>
</div>
<script>
    var btn1 = document.getElementById("btn1");
    var btn2 = document.getElementById("btn2");
    var btn3 = document.getElementById("btn3");
    var j_tb = document.getElementById("j_tb");
    var j_cbAll = document.getElementById("j_cbAll");
    var checkboxes = j_tb.getElementsByTagName("input");

    j_cbAll.onclick = function () {
        if (j_cbAll.checked) {
            for (var i = 0; i < checkboxes.length; i++) {
                checkboxes[i].checked = true;
            }
        } else {
            for (var i = 0; i < checkboxes.length; i++) {
                checkboxes[i].checked = !checkboxes[i].checked;
            }
        }
    }
    for (var i = 0; i < checkboxes.length; i++) {

        checkboxes[i].onclick = function () {
            var isCheckedAll = true;
            for (var j = 0; j < checkboxes.length; j++) {
                if(checkboxes[j].checked === false){
                    isCheckedAll = false;
                    break;
                }
            }
            j_cbAll.checked = isCheckedAll;
        };

    }


    /* btn1.onclick = function () {
     for (var i = 0; i < checkboxes.length; i++) {
     checkboxes[i].checked = true;
     }
     }
     btn2.onclick = function () {

     }
     btn3.onclick = function () {
     for (var i = 0; i < checkboxes.length; i++) {
     checkboxes[i].checked = !checkboxes[i].checked;
     }
     }*/
</script>
</body>
</html>
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标签的全选和反选

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