PhantomJS：操作在通过AJAX加载资源时取消

Question

这是我的代码：

page.onResourceRequested = function (requestData, networkRequest) {
    console.log(requestData.url); // This message shows http://website-with-jquery-included.com/page.html!
}

page.onResourceError = function(resourceError) {
  console.log('Unable to load resource (#' + resourceError.id + 'URL:' + resourceError.url + ')');
  console.log('Error code: ' + resourceError.errorCode + '. Description: ' + resourceError.errorString);
};

page.open('http://website-with-jquery-included.com/', function(status) {
    if (status === "success") {

        page.evaluate(function() {

            console.log('I can see this message');

            $.ajax({url: 'http://website-with-jquery-included.com/page.html', success: function(resp) {
                console.log('I cannot see this message!');
            }});
        });
    }
});

函数page.onResourceError输出错误消息：

  

无法加载资源   （＃35URL：http://website-with-jquery-included.com/page.html）

     

错误代码：5。说明：取消操作

为什么取消了？我没有手动取消任何东西。它在浏览器（谷歌浏览器）中运行良好。