各位，帮我解释下这段代码啊 详细点 谢谢了！

小弟菜鸟，跟着公司项目学习中，哪位大侠帮我解释下   下面这段代码啊！！      详细点！！！     谢谢了

function cancel_A() {
        if ($(":radio:checked").length > 0) {
            var info = $(":radio:checked").val();
            eval("obj=" + info);
            if (confirm("确定要作废此信息？ID:" + obj.id)) {
                $.ajax({
                    type:       "POST",
                    url:        "<c:url value="/cancelTarget.do"></c:url>" + "?date_s=" + getCurTime(),      //可改为调用的.do路径
                    data:       obj,
                    dataType:   'json',
                    success:    function(data) {
                        alert(data.msg.msg);
                        if (data.msg.flag == 1) {
                            $("#form1").submit();
                        }
                    },error:    function() {
                        alert("请求失败！");
                    }
                });
            }
        } else {
            alert("请先选择要作废的记录！");
        }