function Ajax(recvType){
var aj=new Object();
aj.recvType=recvType ? recvType.toUpperCase() : 'HTML' //HTML XML
aj.targetUrl='';
aj.sendString='';
aj.resultHandle=null;
aj.createXMLHttpRequest=function(){
var request=false;
//window对象中有XMLHttpRequest存在就是非IE，包括（IE7，IE8）
if(window.XMLHttpRequest){
request=new XMLHttpRequest();
if(request.overrideMimeType){
request.overrideMimeType("text/xml");
}
//window对象中有ActiveXObject属性存在就是IE
}else if(window.ActiveXObject){
var versions=['Microsoft.XMLHTTP', 'MSXML.XMLHTTP', 'Msxml2.XMLHTTP.7.0','Msxml2.XMLHTTP.6.0','Msxml2.XMLHTTP.5.0', 'Msxml2.XMLHTTP.4.0', 'MSXML2.XMLHTTP.3.0', 'MSXML2.XMLHTTP'];
for(var i=0; i<versions.length; i++){
try{
request=new ActiveXObject(versions[i]);
if(request){
return request;
}
}catch(e){
request=false;
}
}
}
return request;
}
aj.XMLHttpRequest=aj.createXMLHttpRequest();
aj.processHandle=function(){
if(aj.XMLHttpRequest.readyState == 4){
if(aj.XMLHttpRequest.status == 200){
if(aj.recvType=="HTML")
aj.resultHandle(aj.XMLHttpRequest.responseText);
else if(aj.recvType=="XML")
aj.resultHandle(aj.XMLHttpRequest.responseXML);
}
}
}
aj.get=function(targetUrl, resultHandle){
aj.targetUrl=targetUrl;
if(resultHandle!=null){
aj.XMLHttpRequest.onreadystatechange=aj.processHandle;
aj.resultHandle=resultHandle;
}
if(window.XMLHttpRequest){
aj.XMLHttpRequest.open("get", aj.targetUrl);
aj.XMLHttpRequest.send(null);
}else{
aj.XMLHttpRequest.open("get", aj.targetUrl, true);
aj.XMLHttpRequest.send();
}
}
aj.post=function(targetUrl, sendString, resultHandle){
aj.targetUrl=targetUrl;
if(typeof(sendString)=="object"){
var str="";
for(var pro in sendString){
str+=pro+"="+sendString[pro]+"&";
}
aj.sendString=str.substr(0, str.length-1);
}else{
aj.sendString=sendString;
}
if(resultHandle!=null){
aj.XMLHttpRequest.onreadystatechange=aj.processHandle;
aj.resultHandle=resultHandle;
}
aj.XMLHttpRequest.open("post", targetUrl);
aj.XMLHttpRequest.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
aj.XMLHttpRequest.send(aj.sendString);
}
return aj;
}
调用方法：
<script src="ajax.js"> </script>
<script>
var ajax=Ajax();
/* ajax.get("server.php?username=zhangsan&email=aaa@bbb", function(data){
alert(data);
});
*/
/* ajax.post("server.php", "username=value&aaa=bb", function(data){
alert(data);
});
*/
ajax.post("server.php", {username:"zs",age:10,sex:"nan"});
</script>
实例应用：表单唯一性校验
form.html:
<script src="ajax.js"></script>
<script>
function show(username){
if(username==""){
alert("用户名不能为空!");
return;
}
var ajax=Ajax();
var userobj=document.getElementById("userid");
ajax.post("form.php", {username:username}, function(data){
userobj.innerHTML=data;
});
}
</script>
<form action="reg.php" method="post">
username: <input type="text" onblur="show(this.value)" name="username"><span id="userid"></span><br>
password: <input type="password"><br>
<input type="submit" value="submit">
</form>
form.php：
<?php
header("Content-Type:text/html;charset=utf-8");
$mysqli=new mysqli("localhost", "root", "root", "db");
$result=$mysqli->query("select * from users where name='{$_POST["username"]}'");
if($result->num_rows > 0){
echo "<font color='red'>用户{$_POST["username"]}已经存在,不能使用</font>";
}else{
echo "<font color='green'>用户{$_POST["username"]}可以使用</font>";
}
?>
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