/*--------------  示例一  ----------------*/ajax({url: "https://m.baidu.com/su", //请求地址type: "POST", //请求方式data: { wd:'te'}, //请求参数dataType: "json",success: function (response, xml) {// 此处放成功后执行的代码console.log(response,xml);},error: function (status) {console.log(status);}
});function ajax(options) {options = options || {};options.type = (options.type || "GET").toUpperCase();options.dataType = options.dataType || "json";var params = formatParams(options.data);//创建 - 非IE6 - 第一步if (window.XMLHttpRequest) {var xhr = new XMLHttpRequest();} else { //IE6及其以下版本浏览器var xhr = new ActiveXObject('Microsoft.XMLHTTP');}//接收 - 第三步xhr.onreadystatechange = function () {if (xhr.readyState == 4) {var status = xhr.status;if (status >= 200 && status < 300) {options.success && options.success(xhr.responseText, xhr.responseXML);} else {options.error && options.error(status);}}}//连接 和 发送 - 第二步if (options.type == "GET") {xhr.open("GET", options.url + "?" + params, true);xhr.send(null);} else if (options.type == "POST") {xhr.open("POST", options.url, true);//设置表单提交时的内容类型xhr.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");xhr.send(params);}
}
//格式化参数
function formatParams(data) {var arr = [];for (var name in data) {arr.push(encodeURIComponent(name) + "=" + encodeURIComponent(data[name]));}arr.push(("v=" + Math.random()).replace(".",""));return arr.join("&");
}

/*-----------  示例二  ---------------*/

function Ajax(type, url, data, success, failed){// 创建ajax对象var xhr = null;if(window.XMLHttpRequest){xhr = new XMLHttpRequest();} else {xhr = new ActiveXObject('Microsoft.XMLHTTP')}var type = type.toUpperCase();// 清除缓存var random = Math.random();if(typeof data == 'object'){var str = '';for(var key in data){str += key+'='+data[key]+'&';}data = str.replace(/&$/, '');}if(type == 'GET'){if(data){xhr.open('GET', url + '?' + data, true);} else {xhr.open('GET', url + '?t=' + random, true);}xhr.send();} else if(type == 'POST'){xhr.open('POST', url, true);// 如果需要像 html 表单那样 POST 数据，请使用 setRequestHeader() 来添加 http 头。xhr.setRequestHeader("Content-type", "application/x-www-form-urlencoded");xhr.send(data);}// 处理返回数据xhr.onreadystatechange = function(){if(xhr.readyState == 4){if(xhr.status == 200){success(xhr.responseText);} else {if(failed){failed(xhr.status);}}}}
}// 调用
var data= {name:'asher',sex:'male'};
Ajax('get', './data.json', data, function(data){console.log(data);
}, function(error){console.log(error);
});