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//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]);
}
}