判断浏览器，pc端，移动端的js原生方法

方法一

function IsPC() {
    var flag = true;
    var userAgentInfo = navigator.userAgent.toLowerCase();
//    alert(userAgentInfo);
    var WindowsPhoneReg  = /windows (ce|phone|mobile)( os)?\s*(\d+.?)+\d+/;
    var AndroidReg  = /android\s*(\d+.?)+\d+/;
    var IpadReg  = /ipad/;
    var YpodReg  = /ipod/;
    var YpadReg  = /ipad/;
    var YphoneReg  = /iphone/;
    var SymbianReg  = /symbian/;
    var BlackBerryReg  = /blackberry/;
    var JavaReg  = /java[\s]+([\d\w\.\-]+)/;
    if(WindowsPhoneReg.test(userAgentInfo)||
            AndroidReg.test(userAgentInfo)||
            IpadReg.test(userAgentInfo)||
            YpodReg.test(userAgentInfo)||
            YpadReg.test(userAgentInfo)||
            YphoneReg.test(userAgentInfo)||
            SymbianReg.test(userAgentInfo)||
            BlackBerryReg.test(userAgentInfo)||
            JavaReg.test(userAgentInfo)){
        flag = false;
    }
    return flag;
}

方法二

 

var BrowserDetect = {
    init: function () {
        this.browser = this.searchString(this.dataBrowser) || "An unknown browser";
        this.version = this.searchVersion(navigator.userAgent)
            || this.searchVersion(navigator.appVersion)
            || "an unknown version";
        this.OS = this.searchString(this.dataOS) || "an unknown OS";
    },
    searchString: function (data) {
        for (var i=0;i<data.length;i++) {
            var dataString = data[i].string;
            var dataProp = data[i].prop;
            this.versionSearchString = data[i].versionSearch || data[i].identity;
            if (dataString) {
                if (dataString.indexOf(data[i].subString) != -1)
                    return data[i].identity;
            }
            else if (dataProp)
                return data[i].identity;
        }
    },
    searchVersion: function (dataString) {
        var index = dataString.indexOf(this.versionSearchString);
        if (index == -1) return;
        return parseFloat(dataString.substring(index+this.versionSearchString.length+1));
    },
    dataBrowser: [
        {
            string: navigator.userAgent,
            subString: "Chrome",
            identity: "Chrome"
        },
        {   string: navigator.userAgent,
            subString: "OmniWeb",
            versionSearch: "OmniWeb/",
            identity: "OmniWeb"
        },
        {
            string: navigator.vendor,
            subString: "Apple",
            identity: "Safari",
            versionSearch: "Version"
        },
        {
            prop: window.opera,
            identity: "Opera",
            versionSearch: "Version"
        },
        {
            string: navigator.vendor,
            subString: "iCab",
            identity: "iCab"
        },
        {
            string: navigator.vendor,
            subString: "KDE",
            identity: "Konqueror"
        },
        {
            string: navigator.userAgent,
            subString: "Firefox",
            identity: "Firefox"
        },
        {
            string: navigator.vendor,
            subString: "Camino",
            identity: "Camino"
        },
        {       // for newer Netscapes (6+)
            string: navigator.userAgent,
            subString: "Netscape",
            identity: "Netscape"
        },
        {
            string: navigator.userAgent,
            subString: "MSIE",
            identity: "Explorer",
            versionSearch: "MSIE"
        },
        {
            string: navigator.userAgent,
            subString: "Gecko",
            identity: "Mozilla",
            versionSearch: "rv"
        },
        {       // for older Netscapes (4-)
            string: navigator.userAgent,
            subString: "Mozilla",
            identity: "Netscape",
            versionSearch: "Mozilla"
        }
    ],
    dataOS : [
        {
            string: navigator.platform,
            subString: "Win",
            identity: "Windows"
        },
        {
            string: navigator.platform,
            subString: "Mac",
            identity: "Mac"
        },
        {
               string: navigator.userAgent,
               subString: "iPhone",
               identity: "iPhone/iPod"
        },
        {
            string: navigator.platform,
            subString: "Linux",
            identity: "Linux"
        }
    ]

};
BrowserDetect.init();

 if(BrowserDetect.browser==='Explorer'){
      this.src = this.src;
}

 var t_scroll_width = BrowserDetect.browser==='Mozilla'||BrowserDetect.browser==='Opera'||BrowserDetect.browser==='Explorer'?scrollbarWidth():0;