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js 如何判断是否是ios设备?

这段代码有什么问题一直提示括号不匹配?
var isiOS = !!u.match(/(i[^;]+;( U;)? CPU.+Mac OS X/);


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by (71.8m points)
/** 
 * 智能机浏览器版本信息:
 */
 
 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()
}
document.writeln("语言版本: "+browser.language);
document.writeln(" 是否为移动终端: "+browser.versions.mobile);
document.writeln(" ios终端: "+browser.versions.ios);
document.writeln(" android终端: "+browser.versions.android);
document.writeln(" 是否为iPhone: "+browser.versions.iPhone);
document.writeln(" 是否iPad: "+browser.versions.iPad);
document.writeln(navigator.userAgent); 

if( browser.versions.android || browser.versions.iPhone || browser.versions.iPad) {
    window.location.href="http://m.shanmao.me" 
} else {
    alert("不是移动设备");
}

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