高手帮我找出错误
四个文件，计算除法得出结果。
morephp.html
<!DOCTYPE html><html> <head> <title>Practical AJAX: PHP Parameters and Error Handling</title> <script type="text/javascript" src="morephp.js"></script> </head> <body> Ask server to divide <input type="text" id ="firstNumber" /> by <input type="text" id ="secondNumber" /> <input type="button" value="Send" onclick="process()" /> <div id="myDivElement" /> </body></html>
var xmlHttp = createXmlHttpRequestObject();function createXmlHttpRequestObject(){ var xmlHttp; try { xmlHttp = new XMLHttpRequest(); } catch(e) { var XmlHttpVersions = new Array("MSXML2.XMLHTTP.6.0", "MSXML2.XMLHTTP.5.0", "MSXML2.XMLHTTP.4.0", "MSXML2.XMLHTTP.3.0", "MSXML2.XMLHTTP" "Microsoft.XMLHTTP"); for ( var i=0;i<XmlHttpVersions.length && !xmlHttp;i++) { try { xmlHttp = new ActiveXobject(XmlHttpVersions[i]); } catch(e) {} } }if (!xmlHttp) alert("Error creating the XMLHttpRequest object.");else return xmlHttp;}function process(){ if (xmlHttp) { try { var firstNumber = document.getElementById("firstNumber").value; var secondNumber = document.getElementById("secondNumber").value; var params = "firstNumber=" + firstNumber + "&secondNumber=" + secondNumber; xmlHttp.open("GET","morephp.php?" =params, true); xmlHttp.onreadystatechange = handleRequestStateChange; xmlHttp.send(null); } catch (e) { alert("Can't connect to server:\n" + e.toString()); } }}function handleRequestStateChange(){ if (xmlHttp.readyState == 4) { if (xmlHttp.readyState == 200) { try { handleServerResponse(); } catch(e) { alert("Error reading the response:" + e.toString()); } } else { alert("There was a problem retrieving the data:\n" + xmlHttp.statusText); } }}function handleServerResponse(){ var xmlResponse = xmlHttp.responseXML; if (!xmlResponse || !xmlResponse.documentElement) throw("Invalid XML structure:\n" + xmlHttp.responseText); var rootNodeName = xmlResponse.documentElement.nodeName; if (rootNodeName == "parsererror") throw("Invalid XML structrue:\n" +xmlHttp.responseText); xmlRoot = xmlResponse.documentElement; if (rootNodeName != "response" || !xmlRoot.firstChild) throw("Invalid XML structure:\n" + xmlHttp.responseText); responseText = xmlRoot.firstChild.data; myDiv = document.getElementById("myDivElement"); myDiv.innerHTML = "Server Says the answer is : " +responseText;}<?phprequire_once('error_handler.php');header('Content-Type: text/xml');$firstNumber = $_GET['firstNumber'];$secondNumber = $_GET['secondNumber'];$result = $firstNumber / $secondNumber;$dom = new DOMDocument();$response = $dom->createElement('response');$dom->appendChild($response);$responseText = $dom->createTextNode($result);$response->appendChild($responseText);$xmlString = $dom->saveXML();echo $xmlString;?>
<?phpset_error_handler('error_handler',E_ALL);function error_handler($errNo,$errStr,$errFile,$errLine){ if (ob_get_length()) ob_clean(); $error_message = 'ERRNO: ' .$errNo .chr(10) . 'TEXT: ' . $errStr .chr(10) . 'LOCATION: ' . $errFile . ', line ' . $errLine; echo $error_message; exit;}?>