相关疑难解决方法(0)

我对xhr返回事件感到困惑,正如我所知,onreadystatechange - > readyState == 4和onload 之间没有太多不同,是真的吗？

var xhr = new XMLHttpRequest();
xhr.open("Get", url, false);
xhr.onreadystatechange = function() {
    if (xhr.readyState === 4)
    {
        /* do some thing*/
    }
};

xhr.send(null);

要么

xhr.onload = function() { /* do something */ }

这是我的代码:

var XMLHttpRequest = require("xmlhttprequest").XMLHttpRequest;
var xhr = new XMLHttpRequest();
xhr.open("GET", "//URL")
xhr.setRequestHeader("Content-Type: application/json", "Authorization: Basic //AuthKey");
xhr.send();

我收到错误:

Cannot find module 'xmlhttprequest'

当我删除第一行时,我得到:

XMLHttpRequest is not defined

我已经搜遍过各地,人们已经提到Node.js的问题,但我的Node安装是正确的,所以我不确定是什么问题.

我正在查看以下API:

http://wiki.github.com/soundcloud/api/oembed-api

他们给出的例子是

呼叫:

http://soundcloud.com/oembed?url=http%3A//soundcloud.com/forss/flickermood&format=json

响应:

{
"html":"<object height=\"81\" ... ",
"user":"Forss",
"permalink":"http:\/\/soundcloud.com\/forss\/flickermood",
"title":"Flickermood",
"type":"rich",
"provider_url":"http:\/\/soundcloud.com",
"description":"From the Soulhack album...",
"version":1.0,
"user_permalink_url":"http:\/\/soundcloud.com\/forss",
"height":81,
"provider_name":"Soundcloud",
"width":0
}

我需要做什么才能从一个网址获取这个JSON对象？

我想提取YouTube视频的标题.我怎样才能做到这一点？

谢谢.