js判断ie方法集锦

是否是Opera：<mce:script type="text/javascript"><!--is_opera = /opera/i.test(navigator.userAgent);alert(is_opera);// --></mce:script> 

是否是IE：<mce:script type="text/javascript"><!--is_opera = /opera/i.test(navigator.userAgent);var is_ie = (/msie/i.test(navigator.userAgent) && !is_opera)alert(is_ie);// --></mce:script> 

是否是ie7：<mce:script type="text/javascript"><!--(is_ie && /msie 7/.0/i.test(navigator.userAgent));// --></mce:script> 

以下全部是判断是否IE1、<mce:script type="text/javascript"><!--var isIe = /msie/i.test(navigator.userAgent);alert(isIe);// --></mce:script>2、<mce:script type="text/javascript"><!-- if(document.uniqueID){ alert("脚本在IE浏览器中运行！"); }else{ alert("脚本在非IE浏览器中运行！"); }// --></mce:script>3、<mce:script language="javascript"><!-- if(window.ActiveXObject) alert("is IE"); else alert("not's IE");// --></mce:script>