动态加载css和javascript
//dynamically loading .js or .css file function loadjscssfile(filename, filetype){ var fileref; if (filetype=="js"){ //if filename is a external JavaScript file fileref = document.createElement('script'); fileref.setAttribute("type","text/javascript"); fileref.setAttribute("src", filename); } else if (filetype=="css"){ //if filename is an external CSS file 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);}??