小Ajax的JavaScript库 [英] Small Ajax JavaScript library
问题描述
我在寻找一个非常小的(单行)的Ajax JavaScript库中添加的一个小剧本的第一线做出一些要求。
I'm looking for a very small (one liner) Ajax JavaScript library to add on the first line of a small script to make some requests.
我已经尝试过:
但他们并没有在所有的工作。替代方案?
But they do not work at all. Alternatives?
推荐答案
在这里你去,pretty的简单:
Here you go, pretty simple:
function createXHR()
{
var xhr;
if (window.ActiveXObject)
{
try
{
xhr = new ActiveXObject("Microsoft.XMLHTTP");
}
catch(e)
{
alert(e.message);
xhr = null;
}
}
else
{
xhr = new XMLHttpRequest();
}
return xhr;
}
文件是这里
例如:
var xhr = createXHR();
xhr.onreadystatechange = function()
{
if (xhr.readyState === 4)
{
alert(xhr.responseText);
}
}
xhr.open('GET', 'test.txt', true)
xhr.setRequestHeader('Content-type', 'application/x-www-form-urlencoded');
xhr.send()
更新:
为了做跨域脚本,你要么不得不叫出到本地服务器端代理(读取和Echo的远程数据),或者,如果远程服务返回的JSON,使用此方法:
In order to do cross-domain scripting, you'll either have to call out to a local server-side proxy (which reads and echo's the remote data), or, if your remote service returns JSON, use this method:
var s = document.createElement('script')
s.src = 'remotewebservice.json';
document.body.appendChild(s);
由于JSON本质上是一个JavaScript对象或数组,这是一个有效的来源。您的理论上的应该然后就可以直接调用远程服务。我没有测试过这一点,但它似乎是一个公认的做法:
Since JSON is essentially a JavaScript object or array, this is a valid source. You theoretically should then be able to call the remote service directly. I haven't tested this, but it seems to be an accepted practice:
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