js判断手机浏览器版本和是否是ios9版本

<script>

        var browser = {

            versions: function () {

                var u = navigator.userAgent, app = navigator.appVersion;

                return {//移动终端浏览器版本信息

                    trident: u.indexOf('Trident') > -1, //IE内核

                    presto: u.indexOf('Presto') > -1, //opera内核

                    webKit: u.indexOf('AppleWebKit') > -1, //苹果、谷歌内核

                    gecko: u.indexOf('Gecko') > -1 && u.indexOf('KHTML') == -1, //火狐内核

                    mobile: !!u.match(/AppleWebKit.*Mobile.*/) || !!u.match(/AppleWebKit/), //是否为移动终端

                    ios: !!u.match(/\(i[^;]+;( U;)? CPU.+Mac OS X/), //ios终端

                    android: u.indexOf('Android') > -1 || u.indexOf('Linux') > -1, //android终端或者uc浏览器

                    iPhone: u.indexOf('iPhone') > -1 || u.indexOf('Mac') > -1, //是否为iPhone或者QQHD浏览器

                    iPad: u.indexOf('iPad') > -1, //是否iPad

                    webApp: u.indexOf('Safari') == -1 //是否web应该程序，没有头部与底部

                };

            } (),

            language: (navigator.browserLanguage || navigator.language).toLowerCase()

        }

        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)
4000
|| 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

        }

        function Returl_url(app_url) {

            if (browser.versions.ios || browser.versions.iPhone || browser.versions.iPad) {

                if (isIOS9()) {

                    window.location = "";

                }

                else {

                    window.location = "";

                }

            }

            else if (browser.versions.android) {

                window.location = app_url;

            }

            else {

                window.location = app_url;

            }

        }

  </script>