javascript 阿贾克斯状态= 0
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ajax status = 0
提问by cheng
i'm trying to get information from a remote server on my local machine. readyState has no problem, i.e. ==4. however, status is always 0(instead of 200) when I hit the button, it returns nothing.
我正在尝试从本地机器上的远程服务器获取信息。readyState 没有问题，即 ==4。然而，当我按下按钮时，状态总是 0（而不是 200），它什么都不返回。
here is the code,:
这是代码，：
<html>
<head>
<script type="text/javascript">
function loadXMLDoc()
{
var xmlhttp;
if (window.XMLHttpRequest)
{// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp=new XMLHttpRequest();
}
else
{// code for IE6, IE5
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange=function()
{
if (xmlhttp.readyState==4 && xmlhttp.status==200)
{
document.getElementById("myDiv").innerHTML=xmlhttp.responseText;
}
}
xmlhttp.open("GET",'http://www.spartanbook.com/textbooks_xml.asp?control=campus&campus=45&term=80',true);
xmlhttp.send();
}
</script>
</head>
<body>
<div id="myDiv"><h2>Let AJAX change this text</h2></div>
<button type="button" onclick="loadXMLDoc()">Change Content</button>
</body>
</html>
It's basically from w3shcools. simply replaced the url. the url I'm using is working when I paste it into address bar of my browser.
它基本上来自 w3shcools。简单地替换了网址。当我将其粘贴到浏览器的地址栏中时，我正在使用的 url 正在工作。
Any idea? Thanks!!
任何的想法？谢谢！！
回答by Gavin
Check that you are not making a cross domain request.
检查您没有发出跨域请求。
If for example you are not serving this page from http://www.spartanbook.comthen the expected result would be access denied, which oddly enough gives a readyState of 4, but a status of 0.
例如，如果您不是从http://www.spartanbook.com提供此页面，那么预期的结果将是访问被拒绝，奇怪的是，readyState 为 4，但状态为 0。
If you need to make a cross domain request, then you need to use a proxy.
如果需要进行跨域请求，则需要使用代理。
回答by Hasan Fahim
This error code indicates that the response was empty. Seems like a firewall issue
此错误代码表示响应为空。好像是防火墙问题
回答by Gruber
Like Gavin says, it seems your problem is that you're making a cross domain request, which is blocked by most browsers due to security reasons: http://en.wikipedia.org/wiki/Same_origin_policy
就像 Gavin 说的那样，您的问题似乎是您正在发出跨域请求，由于安全原因，大多数浏览器都阻止了该请求：http: //en.wikipedia.org/wiki/Same_origin_policy
I suggest you move the code from your local computer to a place which satisfies the "Same Origin Policy", in your case that is somewhere on www.spartanbook.com.
我建议您将代码从本地计算机移动到满足“同源策略”的地方，在您的情况下是 www.spartanbook.com 上的某个地方。
However, there is a workaround for the problem, and that is to use JSONP. That will allow you to fetch JSON data from a program on another domain.
但是，该问题有一个解决方法，那就是使用JSONP。这将允许您从另一个域上的程序中获取 JSON 数据。
