Javascript 具有Oauth2 granttype密码的主干

我想用授权类型密码调用OAuth2服务。
我在Jquery中使用主干

帖子的参数：
授权类型=密码
客户端id=[您的应用程序id]
客户机密=[您的客户机密]
用户名=[用户名]
密码=[用户密码]

我尝试了几个NPM插件，但都出现了错误

我已经创建了一个自定义的post AJAX，但这也不起作用：

       var results = $.ajax({

        // The URL to process the request
        url : "https://app1pub.smappee.net/dev/v1/oauth2/token",
        type : "POST",
        data : {
            grant_type : "password",//jshint ignore:line
            username: "myuser",
            password: "secret",
            client_id: "myclient",//jshint ignore:line
            client_secret: "clientSecret"//jshint ignore:line

        },
        beforeSend: function (xhr) {
        xhr.setRequestHeader("Authorization", "Bearer $token");
        xhr.setRequestHeader("Access-Control-Allow-Origin", "*");
        },
        dataType: "json",
        contentType: "application/x-www-form-urlencoded",
        success: function(response) {
           //console.log(response);
           console.log(response.access_token);//jshint ignore:line
           data.access_token = response.access_token;//jshint ignore:line
           //tokenGranted();
        }

    });

    return results.responseText;

（见小提琴：）

请告诉我错误：

"XMLHttpRequest cannot load https://app1pub.smappee.net/dev/v1/oauth2/token. Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost:9000' is therefore not allowed access."

有人知道一个NPM插件可以使用密码granttype吗？最好举个例子。我试过几次，但都没用

---

或者一个AJAX调用，它可以工作吗？或者我做错了什么？

试试这个，但我仍然有一个“访问控制允许来源”错误的问题

var url = 'https://app1pub.smappee.net/dev/v1/oauth2/token';

    // ajax call
    $.ajax({
        type: "POST",
        url: url,
        data: {"grant_type": "password", "client_id": client_id, "client_secret": client_secret,"username": username,"password": password},
        beforeSend : function(xhr) {
          xhr.setRequestHeader("POST", "/dev/v1/oauth2/token HTTP/1.1");
          xhr.setRequestHeader("HOST", "app1pub.smappee.net");
          xhr.setRequestHeader("Content-Type", "application/x-www-form-urlencoded;charset=UTF-8");

        },
        error : function() {
          // error handler
        },
        success: function(data) {
            // success handler
            alert(data["access_token"])
        }