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function AJAX() {var xhr = null;
if(window.XMLHttpRequest) {xhr = new XMLHttpRequest();
} else {try{xhr = new ActiveXObject('Microsoft.XMLHttp');
}catch(e){xhr = new ActiveXObject('msxml2.xmlhttp');
}}//get请求this.get = function(url,success,fail){xhr.open("GET", url,true);
xhr.onreadystatechange=function(){if(xhr.readyState==4) {if(xhr.status==200) {var txt = xhr.responseText;
txt = JSON.parse(txt);
success(txt);
} else {if(fail) {fail(xhr.status);
}}}};
xhr.send(null);
};
//post请求this.post = function (url,param,success,fail) {xhr.open("POST", url,true);
xhr.onreadystatechange=function(){if(xhr.readyState==4) {if(xhr.status==200) {var txt = xhr.responseText;
txt = JSON.parse(txt);
success(txt);
} else {if(fail) {fail(xhr.status);
}}}};
xhr.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
xhr.send(param);
};
}//使用var ajax = new AJAX();
ajax.get("test.json",function(data){//成功回调},function(data){//失败回调});
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