var id_list = [];
$(".btn").click(function(){
    $(".aids").each(function(){
        if($(this).is(":checked") == true) {
            id_list.push($(this).val())
        }
    });
    alert(id_list)
});

Brother, I see you again, Smile manually.jpg

<script>
    $(document).ready(function() {
        $("#click").click(function() {
            var ids=[];
            $("input[name=ids[]]:checked").each(function() {
                ids.push($(this).val()); //push添加元素到数组末尾
            });
            alert(ids); //alert打印数组
        });
    });
    
</script>