如何在客户端判断浏览器的类型（Detecting IE7+ in JavaScript）

 

  // IE 7, mozilla, safari, opera 9
} else {
  // IE6, older browsers
}
This distinguishes between browsers based on the fact that IE 7 knows about the maxHeight css property, whereas previous versions of IE didn’t. Does that seem like a sane approach to you?

Update: over at Ajaxian Arjan points out that it’s a bit simpler to check for window.XmlHttpRequest, which is also new in IE 7.

JAVASCRIPT:

1.  
2. if (typeof document.body.style.maxHeight != "undefined") {
3.   // IE 7, mozilla, safari, opera 9
4. } else {
5.   // IE6, older browsers
6. }
   
   
   
   You can also use the XHR check:

7. 
if (window.XMLHttpRequest) {
// IE 7, mozilla, safari, opera 9
} else {
// IE6, older browsers
}



If script is executed width , then document.body is not available yet.

if (window.XMLHttpRequest) {
if(document.epando){
   alert("ie7");
//IE7
}else{
//mozilla, safari, opera 9…etc
   alert("mozilla");
}
} else {
// IE6, older browsers
   alert("ie6");
}



偶测试了一下，发现这最后一种方法区别不了 IE7还是firefox,请高人指点一下！