后端返回token怎么放到请求头里面

后端返回token怎么放到请求头里面，求指教

$("#register_button").click(function () {
                if($("#verifyId").val().length>0&&$("#register_phone").val().length>0&&$("#register_password").val().length>0){
                    let param_array = $("#register_form").serializeArray();
                    let json = {};
                    for (i in param_array) {
                        json[param_array[i].name] = param_array[i].value;
                    }
                    const json_str = JSON.stringify(json);
                    alert(json_str);
                    $.ajax({
                        url: '${pageContext.request.contextPath}/user/register?t='+new Date().getTime()+ '&verify_code=' + json.verify_code,
                        type: "POST",
                        data: json_str,
                        contentType: "application/json",
                        // dataType: "json",
                        success: function (results) {//请求成功的回调函数
                            if(results.success==true){
                                console.log(results.message);
                                // localStorage.token=results.message;/持久性存储
                                sessionStorage.setItem('token',results.message);//会话存储
                                //跳转到首页
                                $(window).attr("location","${pageContext.request.contextPath}/jsp/home_page.html");
                            }else{
                                alert(results.success);
                            }
                        },
                        error: function (results) {//请求失败的回调函数
                            alert("请求失败！！！");
                        }
                    });
                }else{
                    alert("请填写完整的登录信息！！！");
                }
            });

首先拿到token可以存到浏览器缓存session，cookies，storage等

$.ajax({
    headers: {
        "testheader": "test"
    },
    type: "POST",
    url: "Handler1.ashx",
    contentType: "application/x-www-form-urlencoded",
    success: function (data) {
        //your code
    }
});
 

或者

$.ajax({
    type: "POST",
    url: "Handler1.ashx",
    contentType: "application/x-www-form-urlencoded",
    beforeSend: function (request) {
        request.setRequestHeader("token1", "Chenxizhang");
    },
    success: function (data) {
        //your code
    }
});