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JavaScript实现表格外面有一个全选按钮，点击后能实现全部复选框的选中

来源：爱够旅游网
<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>表格</title>
    <style>
        thead th:not(:first-child) {
            padding: 0 40px;
        }

        tr {
            cursor: default;
        }

        th,
        td {
            height: 30px;
            text-align: center;
        }

        .selected {
            background: rgb(255, 0, 0);
            color: #fff;
        }

        tbody tr:not(.selected):hover {
            background: rgba(130, 75, 219, 0.719);
            color: #fff;
        }
    </style>
</head>

<body>
    <table border="1" cellspacing='0'>
        <thead>
            <tr>
                <th><input type="checkbox" name="" id="check"></th>
                <th>名称</th>
                <th>修改日期</th>
                <th>类型</th>
                <th>大小</th>
            </tr>
        </thead>
        <tbody>

        </tbody>
    </table>
</body>
<script>
    // 创建一个数组
    var arr = [{
            title: '初级阶段',
            data: '2019-5-26',
            type: '文件夹',
            size: '20kb'
        },
        {
            title: '中级阶段',
            data: '2019-5-24',
            type: '文件夹',
            size: '345kb'
        },
        {
            title: '高级阶段',
            data: '2019-5-23',
            type: '文件夹',
            size: '222kb'
        },
        {
            title: '码农阶段',
            data: '2019-5-22',
            type: '文件夹',
            size: '55kb'
        },
        {
            title: '码神阶段',
            data: '2019-5-21',
            type: '文件夹',
            size: '77kb'
        }
    ];
    var tbody = document.querySelector('tbody');
    var str = '';
    // 动态打印表格
    for (let i = 0; i < arr.length; i++) {
        // 模板字符串
        str += `<tr>
            <td><input type="checkbox" name=""></td>
            <td>${arr[i].title}</td>
            <td>${arr[i].data}</td>
            <td>${arr[i].type}</td>
            <td>${arr[i].size}</td>
        </tr>`
    }
    tbody.innerHTML = str;
    // 获取tbody下的input
    var ipts = document.querySelectorAll('tbody input');
    // 获取tbody下的tr
    var trs = document.querySelectorAll('tbody tr');
    var iptsArray = Array.from(ipts);   // 把伪数组转换为真数组
    // 点击全选选择所有的复选框
    check.onclick = function () {
        if (this.checked) {
            for (let i = 0; i < ipts.length; i++) {
                ipts[i].checked = true;    //每个复选框设置为勾选状态
                trs[i].className = 'selected';    //增加class
            }
        } else {
            for (i = 0; i < ipts.length; i++) {
                ipts[i].checked = false;    //每个复选框设置为不勾选状态
                trs[i].className = '';    //删除class
            }
        }
    }
    // 单独的选中效果
    for (let i = 0; i < ipts.length; i++) {
        ipts[i].onchange = function () {
            if (ipts[i].checked) {
                ipts[i].checked = true;
                trs[i].className = 'selected';
            } else {
                ipts[i].checked = false;
                trs[i].className = '';
            }
            // 全部选中
            var res1 = iptsArray.every(function (ele) {
                return ele.checked;
            })
            if (res1) {
                check.checked = true;
            }
            // 全部不选中
            var res2 = iptsArray.every(function (ele) {
                return !(ele.checked);
            })
            if (res2) {
                check.checked = false;
            }
            // 半选状态
            if(!res1&&!res2) {
                check.indeterminate = true;
            }else {
                check.indeterminate = false;
            }
        }
    }
</script>

</html>
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