js去掉checkbox勾选

<input type="checkbox" id="myCheckbox">
<button onclick="uncheck()">取消勾选</button>

<script>
function uncheck() {
    document.getElementById('myCheckbox').checked = false;
}
</script>

<input type="checkbox" class="myCheckboxes">
<input type="checkbox" class="myCheckboxes">
<button onclick="uncheckAll()">全部取消勾选</button>

<script>
function uncheckAll() {
    var checkboxes = document.getElementsByClassName('myCheckboxes');
    for (var i = 0; i < checkboxes.length; i++) {
        checkboxes[i].checked = false;
    }
}
</script>

<input type="checkbox">
<input type="checkbox">
<button onclick="uncheckAll()">全部取消勾选</button>

<script>
function uncheckAll() {
    var checkboxes = document.getElementsByTagName('input');
    for (var i = 0; i < checkboxes.length; i++) {
        if (checkboxes[i].type === 'checkbox') {
            checkboxes[i].checked = false;
        }
    }
}
</script>

window.onload = function() {
    // 你的代码
};