Ajax jquery的库的简化版本

(function(){?? ?//面向外界的唯一变量接口！?? ?var myajax = window.myajax = {};?? ?//作者、版本号等等信息?? ?myajax.author = "考拉";?? ?myajax.version = "1.0.0";?? ?//这个对象有两个属性，get、post属性，都是函数?? ?myajax.get = function(URL,queryJSON,callback){?? ??? ?//创建xhr对象，解决兼容问题?? ??? ?if(window.XMLHttpRequest){?? ??? ??? ?var xhr = new XMLHttpRequest();?? ??? ?}else{?? ??? ??? ?var xhr = new ActiveXObject("Microsoft.XMLHTTP");?? ??? ?}?? ??? ?//结果返回之后做的事情?? ??? ?xhr.onreadystatechange = function(){?? ??? ??? ?if(xhr.readyState == 4){?? ??? ??? ??? ?if(xhr.status >= 200 && xhr.status < 300 || xhr.status == 304){?? ??? ??? ??? ??? ?callback(null,xhr.responseText);?? ??? ??? ??? ?}else{?? ??? ??? ??? ??? ?callback(new Error("没有找到请求的文件"),undefined);?? ??? ??? ??? ?}?? ??? ??? ?}?? ??? ?}?? ??? ?//拼接字符串?? ??? ?var querystring = myajax._queryjson2querystring(queryJSON);?? ??? ?//配置?? ??? ?xhr.open("get",URL + "?" + querystring,true);?? ??? ?//发送?? ??? ?xhr.send(null);?? ?};?? ?//这个对象有两个属性，get、post属性，都是函数?? ?myajax.post = function(URL,callback){?? ??? ?//创建xhr对象，解决兼容问题?? ??? ?if(window.XMLHttpRequest){?? ??? ??? ?var xhr = new window.XMLHttpRequest();?? ??? ?}else{?? ??? ??? ?var xhr = new ActiveXObject("Microsoft.XMLHTTP");?? ??? ?}?? ??? ?//结果返回之后做的事情?? ??? ?xhr.onreadystatechange = function(){?? ??? ??? ?if(xhr.readyState == 4){?? ??? ??? ??? ?if(xhr.status >= 200 && xhr.status < 300 || xhr.status == 304){?? ??? ??? ??? ??? ?callback(null,undefined);?? ??? ??? ??? ?}?? ??? ??? ?}?? ??? ?}?? ??? ?//拼接字符串?? ??? ?var querystring = myajax._queryjson2querystring(queryJSON);?? ??? ?//配置?? ??? ?xhr.open("post",URL,true);?? ??? ?//发送?? ??? ?xhr.setRequestHeader("Content-Type","application/x-www-form-urlencoded");?? ??? ?xhr.send(querystring);?? ?};?? ?//内部函数，查询json变为查询字符串?? ?//输入一个{"name":"kaola","age":18,"sex":"男"}?? ?//返回一个name=kaola&age=18&sex=%E8%C6%B6?? ?myajax._queryjson2querystring = function(json){?? ??? ?var arr = [];?? ?//结果数组?? ??? ?for(var k in json){?? ??? ??? ?arr.push(k + "=" + encodeURIComponent(json[k]));?? ??? ?}?? ??? ?return arr.join("&");?? ?};})();