javascript封装的ajax函数库

function AjaxObj() {
this.xmlHttp = null;
this.Request = function(method, url, data, callback, sync) {
if (window.ActiveXObject) {
this.xmlHttp = new ActiveXObject("Microsoft.XMLHttp");
} else if (window.XMLHttpRequest) {
this.xmlHttp = new XMLHttpRequest();
if (this.xmlHttp.overrideMimeType) {
this.xmlHttp.overrideMimeType('text/xml');
}
}
if (this.xmlHttp) {
var self = this;
if (callback)
this.xmlHttp.onreadystatechange = function(){callback(self.xmlHttp);};
else
this.xmlHttp.onreadystatechange = function(){return;};
if (!method)
method = "POST";
method = method.toUpperCase();
if (method == 'GET') {
this.xmlHttp.open('GET', url + ((typeof data=="string")?('?' + data):""), typeof sync == "boolean" ? sync : true);
this.xmlHttp.send(null);
} else {
this.xmlHttp.open('POST', url, typeof sync == "boolean" ? sync : true);
this.xmlHttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded; charset=UTF-8");
this.xmlHttp.send(data);
}
}
};
this.abort = function() {
if (this.xmlHttp)
this.xmlHttp.abort();
};
this.swRequest = function(cfg){
if(!cfg.url)
return;
this.Request(cfg.method||"POST",cfg.url||"",cfg.data,function(req){
if(req.readyState==4){
if(req.status==200||req.status==0){
var obj = null;
var text = req.responseText;
eval("obj = "+ text);
cfg.success.call(cfg.soap||this,obj);
return;
}else{
cfg.failure.call(cfg.soap||this,"错误!");
return;
}
}
});
};
}

ajax.swRequest({
method:"POST",
sync:false,
url:'?a=manage&m=checkUser',
data:"user="+user.value,
success: function(msg) {
if(msg==1){
flag.value = 'true';
} else {
flag.value = '';
}
},
failure: function(a) {
alert(a);
},
soap:this
});