How to determine whether checkbox is selected in jquery

Jquery method to determine whether checkbox is selected: 1. Use is to determine, the code is [if($('#checkbox-id').is(':checked'))]; 2. Use attr to determine , the code is [if ($('#checkbox-id').attr()].

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The operating environment of this tutorial: windows7 system, jquery3.5.1 version, this method is suitable for all brands of computers.

Jquery method to determine whether the checkbox is selected:

Method one (suggestion):

if ($("#checkbox-id").get(0).checked) {
    // do something
}

Thanks to Doubanlv for adding:

if ($("#checkbox-id")[0].checked) {
    // do something
}

Method two (suggestion):

if($('#checkbox-id').is(':checked')) {
    // do something
}

Method three (may be invalid):

if ($('#checkbox-id').attr('checked')) {
    // do something
}

Method four:

if ($('#checkbox-id').prop('checked')) {
    // do something
}

jquery’s various methods for checkbox Operation

//注意： 操作checkbox的checked,disabled属性时jquery1.6以前版本用attr,1.6以上（包含）建议用prop
    //1、根据id获取checkbox
    $("#cbCheckbox1");
    //2、获取所有的checkbox
    $("input[type='checkbox']");//or
    $("input[name='cb']");
    //3、获取所有选中的checkbox
    $("input:checkbox:checked");//or
    $("input:[type='checkbox']:checked");//or
    $("input[type='checkbox']:checked");//or
    $("input:[name='ck']:checked");
    //4、获取checkbox值
    //用.val()即可，比如：
    $("#cbCheckbox1").val();
    //5、获取多个选中的checkbox值
    var vals = [];
    $('input:checkbox:checked').each(function (index, item) {
        vals.push($(this).val());
    });
    
    //6、判断checkbox是否选中（jquery 1.6以前版本 用  $(this).attr("checked")）
    $("#cbCheckbox1").click(function () {
        if ($(this).prop("checked")) {
            alert("选中");
        } else {
            alert("没有选中");
        }
    });
    //7、设置checkbox为选中状态
    $('input:checkbox').attr("checked", 'checked');//or
    $('input:checkbox').attr("checked", true);
    //8、设置checkbox为不选中状态
    $('input:checkbox').attr("checked", '');//or
    $('input:checkbox').attr("checked", false);
    //9、设置checkbox为禁用状态(jquery<1.6用attr,jquery>=1.6建议用prop)
    $("input[type=&#39;checkbox&#39;]").attr("disabled", "disabled");//or
    $("input[type=&#39;checkbox&#39;]").attr("disabled", true);//or
    $("input[type=&#39;checkbox&#39;]").prop("disabled", true);//or
    $("input[type=&#39;checkbox&#39;]").prop("disabled", "disabled");
    //10、设置checkbox为启用状态(jquery<1.6用attr,jquery>=1.6建议用prop)
    $("input[type=&#39;checkbox&#39;]").removeAttr("disabled");//or
    $("input[type=&#39;checkbox&#39;]").attr("disabled", false);//or
    $("input[type=&#39;checkbox&#39;]").prop("disabled", "");//or
    $("input[type=&#39;checkbox&#39;]").prop("disabled", false);

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