将原生ajax进行封装

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实现，写起来和jQuery差不多

ajax({                type: "POST",                url: "http://share.vr39.com/rest/link/importUserPanoramData",                dataType: "json",                data: {                    "viewUuid": data                },                beforeSend: function() {                    //some js code                 },                success: function(msg) {                    alert(msg.message)                },                error: function() {                    alert("error")                }            });