原生js 完整封装ajax

最近开始看了看跟 Node 相关的内容，联想到了前后台的交互，于是记录一下自己封装的 ajax，初学者，写的糙，望见谅~~

function ajax(json){

if(window.XMLHttpRequest){
var ajax = new XMLHttpRequest();
}
else{
var ajax = new ActiveXObject(“Microsoft.XMLHTTP”);
}

if(json.type==’get’){
ajax.open(‘get’,json.url+’?’+JsonToString(json.data),true);
ajax.send();
}
else if(json.type==’post’){
ajax.open(‘post’,json.url,true);
ajax.setRequestHeader(“Content-Type”,”application/x-www-form-urlencoded”);
ajax.send(JsonToString(json.data));
}

ajax.onreadystatechange = function(){
if(ajax.readyState == 4){
if(ajax.status>=200 && ajax.status<300 || ajax.status == 304){
json.success(ajax.responseText);

}
else{
json.error && json.error();
}
};
};

function JsonToString(json){
var arr = [];
for(var i in json){
arr.push(i+’=’+json[i]);
};
return arr.join(‘&’);
}
}

验证
btn.onclick = function(){
ajax({
‘url’:’http://localhost:9102′,
‘type’:’get’,
‘data’:{
user:user.value,
pass:pass.value
},
success:function(data){
console.log(data)
}
})
}

btn.onclick = function(){
ajax({
‘url’:’http://localhost:9102′,
‘type’:’post’,
‘data’:{
user:user.value,
pass:pass.value
},
success:function(data){
console.log(data)
}
})
}

后台内容
var http = require(‘http’);
urlLib = require(‘url’),
var querystring = require(‘querystring’);
http.createServer(function(req,res){
res.setHeader(‘Access-Control-Allow-Origin’,’*’);// 允许跨域

//get
var json = urlLib.parse(req.url,true).query;

//post
var str = ”;
req.on(‘data’,function(data){
str += data;
});

req.on(‘end’,function(){
var json = querystring.parse(str);

res.end();
});

}).listen(9102);