js控制jsp中引入的js文件及css文件

//引入已经加载过的js/css
function loadjscssfile(filename, filetype){
	if (filetype=="js"){
		var fileref=document.createElement('script');
		fileref.setAttribute("type","text/javascript");
		fileref.setAttribute("src",filename);
	}else if (filetype=="css"){
		var fileref=document.createElement("link");
		fileref.setAttribute("rel","stylesheet");
		fileref.setAttribute("type","text/css");
		fileref.setAttribute("href",filename);
	}
	if (typeof fileref!="undefined"){
		document.getElementsByTagName("head")[0].appendChild(fileref);
	}
}

//删除已经加载过的js/css
function removejscssfile(filename,filetype){
	var targetelement=(filetype=="js")? "script" :(filetype=="css")? "link" : "none";
	var targetattr=(filetype=="js")?"src" : (filetype=="css")? "href" :"none";
	var allsuspects=document.getElementsByTagName(targetelement);
	for (var i=allsuspects.length; i>=0;i--){
		if (allsuspects[i] &&allsuspects[i].getAttribute(targetattr)!=null && allsuspects[i].getAttribute(targetattr).indexOf(filename)!=-1)
			allsuspects[i].parentNode.removeChild(allsuspects[i]);
	}
}