js笔记——浏览器及版本判断

判断IE浏览器的时候注意需要做两个判断 一个是msie 一个是Edge

function myBrowser(){
    var userAgent = navigator.userAgent; //取得浏览器的userAgent字符串
    var isOpera = userAgent.indexOf("Opera") > -1; //判断是否Opera浏览器
    var isIE = userAgent.indexOf("compatible") > -1 && userAgent.indexOf("MSIE") > -1 && !isOpera; //判断是否IE浏览器
    var isFF = userAgent.indexOf("Firefox") > -1; //判断是否Firefox浏览器
    var isSafari = userAgent.indexOf("Safari") > -1; //判断是否Safari浏览器
    if (isIE) {
        var IE5 = IE55 = IE6 = IE7 = IE8 = false;
        var reIE = new RegExp("MSIE (\\d+\\.\\d+);");
        reIE.test(userAgent);
        var fIEVersion = parseFloat(RegExp["$1"]);
        IE55 = fIEVersion == 5.5;
        IE6 = fIEVersion == 6.0;
        IE7 = fIEVersion == 7.0;
        IE8 = fIEVersion == 8.0;
        if (IE55) {
            return "IE55";
        }
        if (IE6) {
            return "IE6";
        }
        if (IE7) {
            return "IE7";
        }
        if (IE8) {
            return "IE8";
        }
    }//isIE end
    if (isFF) {
        return "FF";
    }
    if (isOpera) {
        return "Opera";
    }
}//myBrowser() end
//以下是调用上面的函数
if (myBrowser() == "FF") {
    alert("我是 Firefox");
}
if (myBrowser() == "Opera") {
    alert("我是 Opera");
}
if (myBrowser() == "Safari") {
    alert("我是 Safari");
}
if (myBrowser() == "IE55") {
    alert("我是 IE5.5");
}
if (myBrowser() == "IE6") {
    alert("我是 IE6");
}
if (myBrowser() == "IE7") {
    alert("我是 IE7");
}
if (myBrowser() == "IE8") {
    alert("我是 IE8");
}
//或者 
        function myBrowser(){
        var userAgent = navigator.userAgent; //取得浏览器的userAgent字符串
        var isOpera = userAgent.indexOf("Opera") > -1;
        if (isOpera) {
            return "Opera"
        }; //判断是否Opera浏览器
        if (userAgent.indexOf("Firefox") > -1) {
            return "FF";
        } //判断是否Firefox浏览器
        if (userAgent.indexOf("Chrome") > -1){
          return "Chrome";
         }
        if (userAgent.indexOf("Safari") > -1) {
            return "Safari";
        } //判断是否Safari浏览器
        if ((userAgent.indexOf("compatible") > -1 && userAgent.indexOf("MSIE") > -1 && !isOpera)||userAgent.indexOf("Trident") > -1) {
            return "IE";
        }; //判断是否IE浏览器
    }
    //以下是调用上面的函数
    var mb = myBrowser();
        if ("IE" == mb) {
            alert("我是 IE");
        }
        if ("FF" == mb) {
            alert("我是 Firefox");
        }
        if ("Chrome" == mb) {
            alert("我是 Chrome");
        }
        if ("Opera" == mb) {
            alert("我是 Opera");
        }
        if ("Safari" == mb) {
            alert("我是 Safari");
        }

        console.log(navigator.userAgent);

　　

Edge浏览器console　

Mozilla/5.0 (Windows NT 6.1; WOW64; Trident/7.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C; .NET4.0E; rv:11.0) like Gecko　

IE浏览器console[其中IE5和IE7的userAgent是一样的]

Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.1; WOW64; Trident/7.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C; .NET4.0E)

Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; WOW64; Trident/7.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C; .NET4.0E)

Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/7.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C; .NET4.0E)

Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.1; WOW64; Trident/7.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C; .NET4.0E)

Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.1; WOW64; Trident/7.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C; .NET4.0E)

Firefox浏览器console

Mozilla/5.0 (Windows NT 6.1; WOW64; rv:47.0) Gecko/20100101 Firefox/47.0

Google浏览器console

Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/47.0.2526.106 Safari/537.36