How can I check multiple check boxes in jQuery?

This question already has an answer here:

Setting “checked” for a checkbox with jQuery? 38 answers

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这里head_checkbox是顶部标题的id，person类是所有行复选框

 $('#head_checkbox').on('change', function () {
            if ($(this).is(':checked')) {
                $('.person').attr('checked', true);
            } else {
                $('.person').attr('checked', false);
            }
        });

        $('.person').click(function () {
            var total_length = $('.person').length;
            var total_checked_length = $('.person:checked').length;

            if (total_length == total_checked_length) {
                $('#head_checkbox').attr('checked', true);
            } else {
                $('#head_checkbox').attr('checked', false);
            }
        });

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       $('#head_checkbox').click(function () {
            if ($(this).is(':checked')) {
                $('.person').attr('checked', true);
            } else {
                $('.person').attr('checked', false);
            }
        });


        $('.person').click(function () {
            if ($('.person').length == $('.person:checked').length) {
                $('#head_checkbox').attr('checked', true);
            } else {
                $('#head_checkbox').attr('checked', false);
            }
        });

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