js代码判断浏览器种类IE FF Opera Safari chrome及版本

因为ie10-ie11的版本问题，不再支持document.all判断，所以ie判断函数要重新写了

function isIE() { //ie?if(!!window.ActiveXObject || "ActiveXObject"in window)returntrue;elsereturnfalse;}

第一种，只区分浏览器，不考虑版本

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) {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");}

第二种，区分浏览器，并考虑IE5.5 6 7 8

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 endif (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");}

下面给出一个判断当前浏览器是IE的JS代码.

原理是利用了IE与标准浏览器在处理数组的toString方法的差异做成的。对于标准游览器，如果数组里面最后一个字符为逗号，JS引擎会自动剔除它。

<script>var ie = !-[1,]; alert(ie); </script>