单选与全选

Posted 2022-01-29 人间小美味695

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<!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>单选与全选</title>
</head>

<body>
    <h1>单选与全选：</h1>

    <table border="1">
        <tr>
            <th><input type="checkbox"></th>
            <th>单元格2</th>
            <th>单元格3</th>
            <th>单元格4</th>
        </tr>
        <tr>
            <td><input type="checkbox"></td>
            <td>单元格2</td>
            <td>单元格3</td>
            <td>单元格4</td>
        </tr>
        <tr>
            <td><input type="checkbox"></td>
            <td>单元格2</td>
            <td>单元格3</td>
            <td>单元格4</td>
        </tr>
        <tr>
            <td><input type="checkbox"></td>
            <td>单元格2</td>
            <td>单元格3</td>
            <td>单元格4</td>
        </tr>
    </table>
    <script>
        var oneChecked = document.querySelectorAll('td>input');
        var allChecked = document.querySelector('th>input');

        allChecked.onclick = function() 
            for (var i = 0; i < oneChecked.length; i++) 
                if (this.checked) 
                    oneChecked[i].checked = true;
                 else 
                    oneChecked[i].checked = false;
                
            
        

        oneChecked.forEach(function(ele) 
            ele.onclick = function() 
                var checkedEle = document.querySelectorAll('td>input:not(:checked)');

                if (!checkedEle.length) 
                    allChecked.checked = true;
                 else 
                    allChecked.checked = false;
                
            
        )
    </script>
</body>

</html>