javascript js异步加载

为什么80%的码农都做不了架构师？>>>

functionloadFile(url,callBack){varfileNode=document.createElement('script'),fun=function(){document.body.removeChild(fileNode);callBack&&callBack();};if(fileNode.readyState)fileNode.onreadystatechange=function(){if(fileNode.readyState=="loaded"||fileNode.readyState=="complete"){fileNode.onreadystatechange=null;fun();}};elsefileNode.onload=fun;fileNode.src=host+url;document.body.appendChild(fileNode);}