javascript浏览器检测

一段浏览器检测代码
var $browserType_msie = 1;
var $browserType_safari = 2;
var $browserType_Other = 3;
var $browserType_opera = 4;
var browserType;
var browserVersion;
(function () {
    var userAgent = navigator.userAgent.toLowerCase();
    if (userAgent.indexOf('opera') != -1) {
        browserType = $browserType_opera;
    }
    else if (userAgent.indexOf('safari') != -1) {
        browserType = $browserType_safari;
    }
    else if (userAgent.indexOf('msie') != -1) {
        browserType = $browserType_msie;
        browserVersion = userAgent.substring(30, 33);
    }
    else {
        browserType = $browserType_Other;
    }
})();

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