js与jquery的动态加载脚本文件

jQuery.getScript(url,[callback])

function loadJs(name) {
document.write('<script src="'+name+'" type="text/javascript"></script>');
}

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);
}
}
loadjscssfile("do.js","js");