Ajax的原生以及封装

//ajax调用函数

//url,data,type,timeout,success,error

function ajax(json){

json=json || {};

json.data=json.data || {};

json.type=json.type || 'get';

json.timeout=json.timeout || 0;

if(window.XMLHttpRequest){

var oAjax=new XMLHttpRequest();

}else{

var oAjax=new ActiveXObject('Microsoft.XMLHttp');

}

var arr=[];

for(var name in json.data){

arr.push(name+'='+encodeURIComponent(json.data[name]));

}

var sData=arr.join('&');

if(json.type=='post'){

oAjax.open('post',json.url,true);

oAjax.setRequestHeader('Content-Type','application/x-www-form-urlencoded');

oAjax.send(sData);

}else{

oAjax.open('get',json.url+'?'+sData,true);

oAjax.send();

}

oAjax.onreadystatechange=function(){

if(oAjax.readyState==4){

clearTimeout(timer);

if((oAjax.status>=200 && oAjax.status<=300) || oAjax.status==304 ){

json.success && json.success(oAjax.responseText)

}else{

json.error && json.error(oAjax.status);

}

}

}

if(json.timeout){

var timer=setTimeout(function(){

oAjax.abort();

},json.timeout);

}

}

//ajax使用方法;

//var data='act=add&user='+AddT.value+'&pass='+AddPass.value;

//ajax({"url":"user.php","type":"get","data":{},success:function(str){},error:function(){}});