Ajax 对象 包含post和get两种异步传输方式

/**
* @author Supersha
* @QQ:770104121
*/
!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
html>
head>
meta http-equiv="Content-Type" content="text/html; charset=utf-8">
title>Ajax Document/title>
script type="text/javascript">
//注意，编码要同意为utf-8才能避免中文参数和返回中文的乱码问题
function Ajax(prop){
this.action(prop); //在实例化的时候就调用action方法
}
Ajax.prototype = {
createXHR: function(){ //创建XMLHttpRequest对象
var xhr = false;
if (window.XMLHttpRequest) {
xhr = new XMLHttpRequest();
}
else
if (window.ActiveXObject) {
try {
xhr = new ActiveXObject("Msxml2.XMLHTTP");
}
catch (e) {
xhr = new ActiveXObject("Microsoft.XMLHTTP");
}
}
return xhr;
},
action: function(prop){
var xhr = this.createXHR();
if (xhr) {
var url = encodeURI(prop["url"]); //对URL进行编码
if (prop["method"] == "GET" url prop["success"]) { //GET方法
xhr.onreadystatechange = function(){
(function(){ //自执行函数用于检查服务器的返回状态并执行回调函数
if (xhr.readyState == 4 xhr.status == 200) {
prop["success"](xhr); //执行回调函数
}
})();
};
//alert(prop["hander"] instanceof Function);
xhr.open("GET", url, true);
xhr.send(null);
}
else
if (prop["method"] == "POST" url prop["success"]) { //POST方法
xhr.onreadystatechange = function(){
(function(){
if (xhr.readyState == 4 xhr.status == 200) {
prop["success"](xhr); //执行回调函数
}
})();
};
if (prop["params"]) {
url = url.indexOf("?") > -1 ? url + "" + prop["params"] : url +"?" + prop["params"];
}
xhr.open("POST", url, true);
xhr.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
xhr.send(null);
}
}
else
if (!xhr prop["fail"]) {
prop["fail"]();
}
}
}
function getData(){
var ajax = new Ajax({
url: "test.php",
method: "POST",
success: onComplete,
params: "name="+escape("沙锋") //进行编码
});
}
function onComplete(obj){
alert(unescape(obj.responseText)); //进行转码
}
/script>
/head>
body>
input type="button" value="Get Data" onclick="getData()"/>
/body>
/html>