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全選和反選

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    <title>Document</title>
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<body>
    <input type="checkbox" class="checkall">
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    <script>
        var
all = document.querySelector('.checkall') var one = document.querySelectorAll('.checkone') console.log(one) all.onclick = function () { for (var i = 0; i < one.length; i++) { one[i].checked = all.checked } } for (var
i = 0; i < one.length; i++) { one[i].onclick = function () { for (var j = 0; j < one.length; j++) { if (!one[j].checked) { break } } all.checked = j === one.length ? true : false
} } </script> </body> </html>