function isIOS9() {

    //获取固件版本

    var getOsv = function () {

        var reg = /OS ((\d+_?){2,3})\s/;

        if (navigator.userAgent.match(/iPad/i) || navigator.platform.match(/iPad/i) || navigator.userAgent.match(/iP(hone|od)/i) || navigator.platform.match(/iP(hone|od)/i)) {

            var osv = reg.exec(navigator.userAgent);

            if (osv.length > 0) {

                return osv[0].replace('OS', '').replace('os', '').replace(/\s+/g, '').replace(/_/g, '.');

            }

        }

        return '';

    };

    var osv = getOsv();

    var osvArr = osv.split('.');

    //初始化显示ios9引导

    if (osvArr && osvArr.length > 0) {

        if (parseInt(osvArr[0]) >= 9) {

           return true

        }

    }

    return false

}