浏览器嗅探

jQuery提供

(function(jQuery, window, undefined) {
    "use strict";
    var matched, browser;

    jQuery.uaMatch = function(ua) {
        ua = ua.toLowerCase();

        var match = /(chrome)[ \/]([\w.]+)/.exec(ua) ||
            /(webkit)[ \/]([\w.]+)/.exec(ua) ||
            /(opera)(?:.*version|)[ \/]([\w.]+)/.exec(ua) ||
            /(msie) ([\w.]+)/.exec(ua) ||
            ua.indexOf("compatible") < 0 && /(mozilla)(?:.*? rv:([\w.]+)|)/.exec(ua) ||
            [];

        var platform_match = /(ipad)/.exec(ua) ||
            /(iphone)/.exec(ua) ||
            /(android)/.exec(ua) ||
            [];

        return {
            browser: match[ 1 ] || "",
            version: match[ 2 ] || "0",
            platform: platform_match[0] || ""
        };
    };

    matched = jQuery.uaMatch(window.navigator.userAgent);
    browser = {};

    if (matched.browser) {
        browser[ matched.browser ] = true;
        browser.version = matched.version;
    }

    if (matched.platform) {
        browser[ matched.platform ] = true
    }

// Chrome is Webkit, but Webkit is also Safari.
    if (browser.chrome) {
        browser.webkit = true;
    } else if (browser.webkit) {
        browser.safari = true;
    }

    jQuery.browser = browser;

})(jQuery, window);
console.log($.browser);