JS判断当前手机型号

    function getPhoneType() {
        //正则,忽略大小写
        var pattern_phone = new RegExp("iphone", "i");
        var pattern_android = new RegExp("android", "i");
        var userAgent = navigator.userAgent.toLowerCase();
        var isAndroid = pattern_android.test(userAgent);
        var isIphone = pattern_phone.test(userAgent);
        var phoneType = "phoneType";
        if (isAndroid) {
            var zh_cnIndex = userAgent.indexOf("-");
            var spaceIndex = userAgent.indexOf("build", zh_cnIndex + 4);
            var fullResult = userAgent.substring(zh_cnIndex, spaceIndex);
            phoneType = fullResult.split(";")[1];
        } else if (isIphone) {
            //6   w=375    6plus w=414   5s w=320     5 w=320
            var wigth = window.innerWidth || document.documentElement.clientWidth || document.body.clientWidth;
            if (wigth > 400) {
                phoneType = "iphone6 plus";
            } else if (wigth > 370) {
                phoneType = "iphone6";
            } else if (wigth > 315) {
                phoneType = "iphone5 or iphone5s";
            } else {
                phoneType = "iphone 4s";
            }
        } else {
            phoneType = "您的设备太先进了";
        }
        return phoneType;
    }