Ajax+PHP快速上手及简单应用说明

xmlHttp = new ActiveXObject('Microsoft.XMLHTTP');

xmlHttp = new XMLHttpRequest();

XMLHttpRequest.open(传递方式,地址,是否异步请求)

XMLHttpRequest.onreadystatechange

XMLHttpRequest.responseText

var xmlHttp;
function S_xmlhttprequest(){
 if(window.ActiveXObject){
  xmlHttp=new ActiveXObject('Microsoft.XMLHTTP');
 }else if(window.XMLHttpRequest){
  xmlHttp=new XMLHttpRequest();
 }
}
function php100(url){
 S_xmlhttprequest();
 xmlHttp.open("GET","do.php?id="+url,true);
 xmlHttp.onreadystatechange=byphp;
 xmlHttp.send(null);
}
function byphp(){
 var byphp100=xmlHttp.responseText;
 document.getElementById('php100').innerHTML=byphp100;
}

<?PHP
$id=@$_GET[id];
for($i=1;$i<10;$i++){
 echo $id;
}

<script src="test.js" type="text/javascript"></script>
<a href="#" onClick="php100(1)">1</a>&nbsp;||
<a href="#" onClick="php100(2)">2</a>&nbsp;||
<a href="#" onClick="php100(3)">3</a>
<div id="php100"></div>