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"});
    }