js判断移动端系统

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no" >
<meta name="format-detection" content="telephone=no">   
<title>Document</title>
</head>
<body>
<script>
    var isMobile = {
        Android : function() {
            return navigator.userAgent.match(/Android/i) ? true : false;
        },
        BlackBerry : function() {
            return navigator.userAgent.match(/BlackBerry/i) ? true : false;
        },
        iOS : function() {
            return navigator.userAgent.match(/iPhone|iPad|iPod/i) ? true : false;
        },
        Windows : function() {
            return navigator.userAgent.match(/IEMobile/i) ? true : false;
        },
        any : function() {
            return (isMobile.Android() || isMobile.BlackBerry() || isMobile.iOS() || isMobile.Windows());
        }
    };
    
    if (isMobile.iOS()) {
        alert("apple"); 
    } else {
        alert("Android");
    }
</script>
</body>
</html>

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