跨域 Ajax 请求 WSO2 IS

This 'curl' command works perfectly. But when try to call it through ajax:

  $.ajax({
      type: 'POST',
      data: 'grant_type=password&username=admin&password=admin',
      headers: {
        'Content-Type': 'application/x-www-form-urlencoded',
        'Authorization': 'Basic  Z0hLUlA3eThYTmJydl9JR1pJemxDQ1VJQlo0YTozT2VLaUlmUVViMk1yZzZ2YU5uQVFsWFpDU29h'
      },
      url: 'https://localhost:9443/oauth2/token',
      success: function(data) {
        console.log(data);
      }
    })
    };

我收到此错误:"XMLHttpRequest 无法加载 https://localhost:9443/oauth2/token.对预检请求的响应未通过访问控制检查:请求的资源上不存在Access-Control-Allow-Origin"标头.因此，不允许访问原点"."

如何配置 WSO2 IS 来处理它?或者有替代方案吗?