一个简单的Ajax框架:
function $(){
if(arguments.length == 1){
return document.getElementById(arguments[0]);
}
else if(arguments.length == 2){
return arguments[1].documentElement.getElementsByTagName(arguments[0]);
}
}
function Ajax(){
this.call = call;
this.getXMLHttpRequest = getXMLHttpRequest;
}
function getXMLHttpRequest(){
var req;
if (window.XMLHttpRequest) {
req = new XMLHttpRequest();
} else if (window.ActiveXObject) {
req = new ActiveXObject("Microsoft.XMLHTTP");
}
return req;
}
function call(url, success, failure){
var req = this.getXMLHttpRequest();
req.open("GET", url, true);
req.onreadystatechange=function(){
if (req.readyState == 4) {
if (req.status == 200) {
success(req);
}
else{
failure(req);
}
}
};
req.send(null);
}
