原生ajax

function ajax() {

var ajaxData = {

type: arguments[0].type || "GET",

url: arguments[0].url || "",

async: arguments[0].async || "true",

data: arguments[0].data || null,

dataType: arguments[0].dataType || "text",

contentType: arguments[0].contentType || "application/x-www-form-urlencoded",

beforeSend: arguments[0].beforeSend || function () { },

success: arguments[0].success || function () { },

error: arguments[0].error || function () { }

}

ajaxData.beforeSend()

var xhr = createxmlHttpRequest();

xhr.responseType = ajaxData.dataType;

xhr.open(ajaxData.type, ajaxData.url, ajaxData.async);

xhr.setRequestHeader("Content-Type", ajaxData.contentType);

xhr.send(convertData(ajaxData.data));

xhr.onreadystatechange = function () {

if (xhr.readyState == 4) {

if (xhr.status == 200) {

ajaxData.success(xhr.response)

} else {

ajaxData.error()

}

}

}

}

function createxmlHttpRequest() {

if (window.ActiveXObject) {

return new ActiveXObject("Microsoft.XMLHTTP");

} else if (window.XMLHttpRequest) {

return new XMLHttpRequest();

}

}

function convertData(data) {

if (typeof data === 'object') {

var convertResult = "";

for (var c in data) {

convertResult += c + "=" + data[c] + "&";

}

convertResult = convertResult.substring(0, convertResult.length - 1)

return convertResult;

} else {

return data;

}

}

ajax({

type: "POST",

url: "https://rrc.1001.sh/index.php?r=Hotcity&m=Citys",

dataType: "json",

data: {},

beforeSend: function () {

},

success: function (msg) {

console.log(msg,'成功的数据')

},

error: function () {

console.log("error")

}

})