php中使用ajax时ResponseText返回undefined
<!-- Code highlighting produced by Actipro CodeHighlighter (freeware) http://www.CodeHighlighter.com/ --> var URL, ReturnHtml; var objXMLHTTP = new GetXmlHTTP(); alert(objXMLHTTP); //FF下创建对象XMLHttpRequest成功 URL = "getdata.php?username="+ document.getElementById("username").value; objXMLHTTP.open("GET", URL, false); objXMLHTTP.send(null); ReturnHtml = objXMLHTTP.ResponseText; alert(ReturnHtml); //FF下总是返回undefined,十分崩溃!!!
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