浏览器版本检测

在WEB开发中经常性的会遇到浏览器不兼容的问题。要解决兼容性问题就要让代码识别其在哪种内核，直接看代码：

//1、判断浏览器内核var userAgent = navigator.userAgent; //取得浏览器的userAgent字符串var browserType = userAgent.indexOf("Opera");if (browserType!== -1) {    return "欧朋浏览器！";};browserType = userAgent.indexOf("Firefox");if (browserType!== -1) {    return "火狐浏览器！";};browserType = userAgent.indexOf("Chrome");if (browserType!== -1) {    return "谷歌浏览器！";};browserType = userAgent.indexOf("Safari");if (browserType!== -1) {    return "Safari浏览器！";};//2、浏览器中的另类IEvar browser = navigator.appName,     b_version = navigator.appVersion,    version = b_version.split(";"),    trim_Version = version[1].replace(/[ ]/g,""); if (browser=="Microsoft Internet Explorer" && trim_Version=="MSIE6.0") {         alert("IE6！");        e.preventDefault();    } else if (browser=="Microsoft Internet Explorer" && trim_Version=="MSIE7.0") {         alert("IE7");        e.preventDefault();    } else if (browser=="Microsoft Internet Explorer" && trim_Version=="MSIE8.0") {         alert("IE8");        e.preventDefault();    } else if (browser=="Microsoft Internet Explorer" && trim_Version=="MSIE9.0") {         alert("IE9");        e.preventDefault();    } else if (browser=="Microsoft Internet Explorer" && trim_Version=="MSIE10.0") {        alert("IE10！");        e.preventDefault();    }