ajax的使用

$.ajax({
                    url:"ajax",
                    contentType:"application/json;charset=UTF-8",
                    data: ‘{"uname":"abc","age":"20"}‘,
                    dataType:"json",
                    type:"post",
                    success:function (data) {
                        alert(data.uname);
                        alert(data.age)
                    }
                });