function createjscssfile(filename, filetype){ if (filetype=="js"){ //if filename is a external JavaScript file var fileref=document.createElement('script') fileref.setAttribute("type","text/javascript") fileref.setAttribute("src", filename) } else if (filetype=="css"){ //if filename is an external CSS file var fileref=document.createElement("link") fileref.setAttribute("rel", "stylesheet") fileref.setAttribute("type", "text/css") fileref.setAttribute("href", filename) } return fileref }
function replacejscssfile(oldfilename, newfilename, 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(oldfilename)!=-1){ var newelement=createjscssfile(newfilename, filetype); allsuspects[i].parentNode.replaceChild(newelement, allsuspects[i]); } } } //用 "newscript.js" 替换 "oldscript.js" replacejscssfile("oldscript.js", "newscript.js", "js"); //用 "newscript.css" 替换 "oldscript.css" replacejscssfile("oldstyle.css", "newscript.css","css");
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