原谅我真的搞不懂老师写的这串代码的逻辑

Question

 <script type="text/javascript">
            $(function () {
                $.ajaxSetup({
                    type:"POST",
                success:function(data){
                        $("ul").append("<li>你输入的<b>  "
                            + $("#txtNumber").val() + " </b>是<b> "
                            + data + " </b></li>");
                    }
                });
                $("#btnShow_1").bind("click", function () {
                    $.ajax({
                        data: { num: $("#txtNumber").val() },
                        url: "http://www.imooc.com/data/check.php"
                    });
                })
                $("#btnShow_2").bind("click", function () {
                    $.ajax({
                        data: { num: $("#txtNumber").val() },
                        url: "http://www.imooc.com/data/check_f.php"
                    });
                })
            });
        </script>

第一个函数和两个按钮的函数有什么关联性

Answer 1

ajaxSetup这个方法是jq给ajax方法设置默认，下面两按钮ajax方法没有配置的type,success回调上面都已经配置了，也就是下面两个按钮的ajax是post请求，成功回调是success:function(data){                        $("ul").append("<li>你输入的<b>  "                            + $("#txtNumber").val() + " </b>是<b> "                            + data + " </b></li>");                    }