if(!-[1,]){ //是IE placeHolderIE9_(); }else{ //非IE if(navigator.userAgent.indexOf("MSIE 9.0")>0) { //ie9 placeHolderIE9_(); } } function placeHolderIE9_(){ //$("#css-rel").attr({href:"css/indexIT7-8.css"}); }
原文：http://www.cnblogs.com/zhixi/p/6210078.html