ajax请求添加自定义header参数

$.ajax({             type: "post",             url:"http://127.0.0.1:4564/bsky-app/template/testPost",             contentType: "application/json;charset=utf-8",             data :JSON.stringify({"bodyName":"sdfsdf","date":"2017-11-28 07:34:01","price": 10.5,"tbId": 1}),             dataType: "json",             beforeSend: function (XMLHttpRequest) {         XMLHttpRequest.setRequestHeader("token", "eyJhbGciOiJIUzUxMiJ9.eyJzdWIiOiIxOD.....");             },             success: function (data) {             alert(data);             },error:function(error){                 console.log(error);             }         });

beforeSend: function (XMLHttpRequest) {         XMLHttpRequest.setRequestHeader("token", "eyJhbGciOiJIUzUxMiJ9.eyJzdWIiOiIxOD.....");        },

其中，token是服务端自定义的header参数