ajax的server部分(php版).doc

ajax的server部分(php版) ? Server端的任务通常是根据Client的请求，进行逻辑操作，并将结果响应返回。这个响应通常为XML格式(因此server端需要使用PHP的DOM创建XML响应) 1.PHP使用DOM创建XML响应，供client端的JS解析然后在页面中显示;(因此需要熟练PHP的DOM API)其实，PHP生成XML的方法有两种：使用DOM API；（方法一）另一种是直接将XML的内容echo出去即可；（方法二）见示例：HTML页面(包含三个JS触发函数：onmouseover, onmouseout, onclick; 分别触发自己的函数)!doctype html public -//w3c//dtd html 4.0 tRANSITIONAL//enhtmlheadtitle Server PHP Ajax /titlescript type=text/javascript src=js.js/script/head bodyspan onmouseover=PHPechoXML() onmouseout=PHPDOMXML()Default Words/spandiv id=show/divdivideinput type=text id=firstNumber/byinput type=text id=secondNumber/input type=button value=Send onclick=CSparameter()/div id=result/div/body/htmlJS页面(分别定义三个JS触发函数：PHPechoXML, PHPDOMXML, 以及CSparameter)其中有XMLHttpRequest对象创建函数，以及各自的Server响应处理函数///////1. 创建XMLHttpRequest对象var xmlHttp = createXmlHttpRequestObject(); function createXmlHttpRequestObject() ...{? var xmlHttp; ? try? ...{??? // try to create XMLHttpRequest object??? xmlHttp = new XMLHttpRequest();? }? catch(e)? ...{??? // assume IE6 or older??? 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; iXmlHttpVersions.length !xmlHttp; i++) ??? ...{????? try ?????? ...{ ??????? // try to create XMLHttpRequest object??????? xmlHttp = new ActiveXObject(XmlHttpVersions[i]);????? } ????? catch (e) ...{}??? }? }? if (!xmlHttp)??? alert(Error creating the XMLHttpRequest object.);? else ??? return xmlHttp;} ///////2. JavaScript事件响应函数(onmouseover触发)// read a file from the serverfunction PHPechoXML()...{? // only continue if xmlHttp isnt void? if (xmlHttp)? ...{??? // try to connect to the server??? try??? ...{????? // initiate reading a file from the server