下面是我如何为Internet Explorer做自定义CSS:

在我的JavaScript文件:

function isIE () {
      var myNav = navigator.userAgent.toLowerCase();
      return (myNav.indexOf('msie') != -1) ? parseInt(myNav.split('msie')[1]) : false;
}

jQuery(document).ready(function(){
    if(var_isIE){
            if(var_isIE == 10){
                jQuery("html").addClass("ie10");
            }
            if(var_isIE == 8){
                jQuery("html").addClass("ie8");
                // you can also call here some function to disable things that 
                //are not supported in IE, or override browser default styles.
            }
        }
    });

然后在我的CSS文件中，定义每个不同的样式:

.ie10 .some-class span{
    .......
}
.ie8 .some-class span{
    .......
}

//Copy and paste this into your code/text editor, and try it

//Before you use this to fix compatability bugs, it's best to try inform the browser provider that you have found a bug and there latest browser may not be up to date with the current web standards

//Since none of the browsers use the browser identification system properly you need to do something a bit like this

//Write browser identification
document.write(navigator.userAgent + "<br>")

//Detect browser and write the corresponding name
if (navigator.userAgent.search("MSIE") >= 0){
    document.write('"MS Internet Explorer ');
    var position = navigator.userAgent.search("MSIE") + 5;
    var end = navigator.userAgent.search("; Windows");
    var version = navigator.userAgent.substring(position,end);
    document.write(version + '"');
}
else if (navigator.userAgent.search("Chrome") >= 0){
document.write('"Google Chrome ');// For some reason in the browser identification Chrome contains the word "Safari" so when detecting for Safari you need to include Not Chrome
    var position = navigator.userAgent.search("Chrome") + 7;
    var end = navigator.userAgent.search(" Safari");
    var version = navigator.userAgent.substring(position,end);
    document.write(version + '"');
}
else if (navigator.userAgent.search("Firefox") >= 0){
    document.write('"Mozilla Firefox ');
    var position = navigator.userAgent.search("Firefox") + 8;
    var version = navigator.userAgent.substring(position);
    document.write(version + '"');
}
else if (navigator.userAgent.search("Safari") >= 0 && navigator.userAgent.search("Chrome") < 0){//<< Here
    document.write('"Apple Safari ');
    var position = navigator.userAgent.search("Version") + 8;
    var end = navigator.userAgent.search(" Safari");
    var version = navigator.userAgent.substring(position,end);
    document.write(version + '"');
}
else if (navigator.userAgent.search("Opera") >= 0){
    document.write('"Opera ');
    var position = navigator.userAgent.search("Version") + 8;
    var version = navigator.userAgent.substring(position);
    document.write(version + '"');
}
else{
    document.write('"Other"');
}

//Use w3schools research the `search()` method as other methods are availible

所有关于web浏览器的信息都包含在navigator对象中。名字和版本都在那里。

var appname = window.navigator.appName;

来源:javascript浏览器检测

var browser = navigator.appName;
var version = navigator.appVersion;

然而，请注意，两者并不一定反映事实。许多浏览器都可以设置为其他浏览器的掩码。例如，你不能总是确定用户是用IE6还是用伪装成IE6的Opera上网。

我推荐使用小型javascript库Bowser。它基于导航器。userAgent和相当好测试的所有浏览器，包括iphone, android等。

https://github.com/ded/bowser

你可以简单地说:

if (bowser.msie && bowser.version <= 6) {
  alert('Hello IE');
} else if (bowser.firefox){
  alert('Hello Foxy');
} else if (bowser.chrome){
  alert('Hello Chrome');
} else if (bowser.safari){
  alert('Hello Safari');
} else if(bowser.iphone || bowser.android){
  alert('Hello mobile');
}

通常最好尽可能避免使用特定于浏览器的代码。JQuery $。属性可用于检测对特定特性的支持，而不是依赖于浏览器名称和版本。

以Opera为例，你可以伪造internet explorer或firefox实例。

JQuery的详细描述。支持可以在这里找到:http://api.jquery.com/jQuery.support/

现在根据jQuery弃用。

我们强烈建议使用外部库，如Modernizr 而不是依赖于jQuery.support中的属性。

在编写网站代码时，我总是确保，像导航这样的基本功能对非js用户也是可以访问的。这可能是讨论的对象，如果主页是针对特殊受众，可以忽略。