JS判断终端浏览器类型

根据终端浏览器类型不同加载不同的JS或CSS文件

<script>
    var browser = {
        versions: function () {
            var u = navigator.userAgent, app = navigator.appVersion;
            return {
                trident: u.indexOf('Trident') > -, //IE内核
                presto: u.indexOf('Presto') > -, //opera内核
                webKit: u.indexOf('AppleWebKit') > -, //苹果、谷歌内核
                gecko: u.indexOf('Gecko') > - && u.indexOf('KHTML') == -,//火狐内核
                mobile: !!u.match(/AppleWebKit.*Mobile.*/), //是否为移动终端
                ios: !!u.match(/\(i[^;]+;( U;)? CPU.+Mac OS X/), //ios终端
                android: u.indexOf('Android') > - || u.indexOf('Adr') > -, //android终端
                iPhone: u.indexOf('iPhone') > -, //是否为iPhone或者QQHD浏览器
                iPad: u.indexOf('iPad') > -, //是否iPad
                webApp: u.indexOf('Safari') == -, //是否web应该程序，没有头部与底部
                weixin: u.indexOf('MicroMessenger') > -, //是否微信 （2015-01-22新增）
                qq: u.match(/\sQQ/i) == " qq" //是否QQ
            };
        }(), language: (navigator.browserLanguage || navigator.language).toLowerCase()
    }
    if (browser.versions.android) {
        document.write("<script src='http://libs.baidu.com/jquery/2.1.1/jquery.min.js'><\/script>");
        document.write("<script src='http://115.159.115.27/Content/workorder/js/android.js'><\/script>");
    }
    else if (browser.versions.ios) {
        document.write("<script src='http://115.159.115.27/Content/workorder/js/jquery-1.8.3.min.js'><\/script>");
        document.write("<script src='http://115.159.115.27/Content/workorder/js/index.js'><\/script>");
    }
    else {

        document.write("<script src='http://115.159.115.27/Content/workorder/js/jquery-1.8.3.min.js'><\/script>");
        document.write("<script src='http://115.159.115.27/Content/workorder/js/index.js'><\/script>");
    }

</script>