問題描述

我用的是firefox 3.6.10，用firebug來調試

Im using firefox 3.6.10, and firebug to debug

所以，這是我的代碼:

var xmlhttp = new XMLHttpRequest();
xmlhttp.open("GET", url,false);
xmlhttp.setRequestHeader('Content-Type',  'text/xml');
xmlhttp.send(null);
alert(xmlhttp.responseXML);

responseXML 始終為空，我已經在來自不同域的多個 URL 上嘗試過它.我也嘗試過異步，結果是一樣的.responseText 總是正確返回，沒有問題.

responseXML is always null, and i've tried it on several URLs from different domains. I have also tried it asynchronously, it's the same result. The responseText is always properly returned, no problems with it.

我的目標是獲得 responseXML.documentElement.

感謝您的幫助.

編輯-----------
此 javascript 代碼是從 Greasemonkey 用戶腳本執行的，我將其設置為與請求的 url 相同的來源.我也嘗試從螢火控制臺執行，再次確保原產地政策.兩者都有相同的錯誤.
討厭javascript.

EDIT-----------
This javascript code was executed from a Greasemonkey userscript, i made surte its the same origin as the requested url. Also i tried executing from firebug console, again ensuring the origin policy. Same error on both.
Gotta hate javascript.

推薦答案

我敢打賭你違反了同源政策.

I bet you are violating the same origin policy.

對于 XHR，您必須具有相同的協議、域、端口等.因此，如果您在 localhost:8080/app 上運行應用程序，則不能 ajax 到 www.cnn.com.

For XHRs, you must have the same protocol, domain, port, etc. So if you are running an app on localhost:8080/app, you CANNOT ajax to www.cnn.com.

不同的瀏覽器有不同的處理方式；我看到FF按照你的描述做了，就是請求看起來正常返回但是沒有數據...

Different browsers handle this differently; I have seen FF do what you describe, which is the request appears to return normally but there is no data...

這篇關于responseXML 始終為空的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網！