bomhelper.js

function BomHelper() {
    this.ie = "";
    this.firefox = "";
    this.chrome = "";
    this.opera = "";
    this.safari = "";
}
//检测浏览器版本，并保存
BomHelper.prototype.checkBrowerType = function () {
    var ua = navigator.userAgent.toLowerCase();
    var s;
    (s = ua.match(/msie ([\d.]+)/)) ? this.ie = s[1] :
    (s = ua.match(/firefox\/([\d.]+)/)) ? this.firefox = s[1] :
    (s = ua.match(/chrome\/([\d.]+)/)) ? this.chrome = s[1] :
    (s = ua.match(/opera.([\d.]+)/)) ? this.opera = s[1] :
    (s = ua.match(/version\/([\d.]+).*safari/)) ? this.safari = s[1] : 0;
}
//获取ajax对象
BomHelper.prototype.ajaxObj = function () {
    var xmlHttp = null;

    if (this.ie != "") {
        if (typeof ActiveXObject != "undefined") {
            return new XMLHttpRequest();
        } else {
            try {
                xmlHttp = new ActiveXObject("Msxml2.XMLHTTP");
            } catch (ex1) {
                try {
                    xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
                } catch (ex2) {
                    alert("创建ajax对象失败,本网站只支持ie6以上版本浏览器,请刷新页面重试");
                }
            }
        }
    } else {
        try {
            xmlHttp = new XMLHttpRequest();
        } catch (ex3) {
            alert("创建ajax对象失败,请刷新页面重试");
        }
    }
    return xmlHttp;
}
//发送ajax的GET请求
BomHelper.prototype.ajaxGet = function (sUrl, fnAjax, noSync) {
    var xmlHttp = this.ajaxObj();
    xmlHttp.onreadystatechange = function () {
        if (xmlHttp.readyState == 4)
            fnAjax(xmlHttp.responseText);
    }
    if (sUrl.indexOf("?") == -1)
        sUrl = sUrl + "?flesh=" + Math.random();
    else
        sUrl = sUrl + "&flesh=" + Math.random();
    xmlHttp.open("GET", sUrl, (noSync != undefined ? noSync : true));
    xmlHttp.send(null);
}
//发送ajax的post请求
BomHelper.prototype.ajaxPost = function (sUrl, sPostData, fnAjax) {
    var xmlHttp = this.ajaxObj();

    xmlHttp.onreadystatechange = function () {
        if (xmlHttp.readyState == 4)
            fnAjax(xmlHttp.responseText);
    }
    if (sPostData == "")
        sPostData = sPostData + "flesh=" + Math.random();
    else
        sPostData = sPostData + "&flesh=" + Math.random();
    xmlHttp.open("POST", sUrl, true);
    xmlHttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
    xmlHttp.send(sPostData);
}

//同步获取xml文件
BomHelper.prototype.ajaxXml = function (sUrl, sys, fnAjax) {
    var xmlHttp = this.ajaxObj();
    xmlHttp.onreadystatechange = function () {
        if (xmlHttp.readyState == 4)
            fnAjax(xmlHttp.responseXML);
    }
    if (sUrl.indexOf("?") == -1)
        sUrl = sUrl + "?flesh=" + Math.random();
    else
        sUrl = sUrl + "&flesh=" + Math.random();
    xmlHttp.open("GET", sUrl, sys);
    xmlHttp.send(null);
}

//若是IE7以上版本，则要求它使用IE7
BomHelper.prototype.useIE7 = function () {
    document.write("<meta content=\"IE=EmulateIE7\" http-equiv=\"X-UA-Compatible\">");
}

var bomHelper = new BomHelper();
bomHelper.checkBrowerType();

调用方法

bomHelper.ajaxGet("/api/time", function (data) {
    var t = new Date(data.substr(0, 4), parseInt(data.substr(4, 2)) - 1, data.substr(6, 2), data.substr(8, 2), data.substr(10, 2), data.substr(10, 2));
    timeDiff = parseInt(((new Date()).getTime() - t.getTime()) / 1000);
console.log(data)//20190821104926
    console.log(data.substr(0, 4))//2019
    console.log(new Date().getTime())//1566355766810
    console.log(t.getTime() / 1000)//1566355789
    console.log(t)//Wed Aug 21 2019 10:49:49 GMT+0800 (中国标准时间)
    console.log(timeDiff)//-22
});