无框架的JavaScript Ajax请求

问题描述：

时，任何人都知道如何使Ajax请求的功能，工程跨浏览器没有JavaScript框架？

is anyone know how to make ajax request function that works cross-browser WITHOUT javascript framework ?

答

在 XMLHtt prequest 对象实际上并不是那么复杂使用。要广泛兼容的，你要玩了一下游戏中创建对象，但在它的相当简单的简单的操作。

The XMLHttpRequest object isn't actually all that complicated to use. To be broadly compatible, you have to play a bit of a game to create the object, but after that it's fairly straightforward for simple operations.

微软的例子在 MSDN页 XMLHtt prequest ，包括函数用于创建一个支持IE浏览器的早期版本中一个跨浏览器的方式的对象。下面是他们的榜样：

Microsoft has examples on the MSDN page for XMLHttpRequest, including a function for creating the object in a cross-browser way that supports early versions of IE. Here's their example:

function getXMLHttpRequest() 
{
    if (window.XMLHttpRequest) {
        return new window.XMLHttpRequest;
    }
    else {
        try {
            return new ActiveXObject("MSXML2.XMLHTTP.3.0");
        }
        catch(ex) {
            return null;
        }
    }
}

function handler()
{
    if (oReq.readyState == 4 /* complete */) {
        if (oReq.status == 200) {
            alert(oReq.responseText);
        }
    }
}

var oReq = getXMLHttpRequest();

if (oReq != null) {
    oReq.open("GET", "http://localhost/test.xml", true);
    oReq.onreadystatechange = handler;
    oReq.send();
}
else {
    window.alert("AJAX (XMLHTTP) not supported.");
}

我并不是说上述例证了最佳实践（微软似乎也有自己的MSDN的例子主要是写的非常非常缺乏经验的工程师），但它给你一个起点。例如，在上述要求的响应状态200为成功，在那里当然HTTP规范很清楚，任何东西的200℃; =正＆其中; = 299范围是成功

I'm not suggesting the above exemplifies best practices (Microsoft seems to have their MSDN examples largely written by very, very inexperienced engineers), but it gives you a starting point. For instance, the above requires that the response status be 200 for success, where of course the HTTP specification is clear that anything the 200 <= n <= 299 range is "success".

无框架的JavaScript Ajax请求

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