实例:
var nod = document.createElement(“style”), str = “body{background:#000;color:#fff} a{color:#fff;text-decoration:none;} a:hover{color:red;text-decoration:underline}”; nod.type=”text/css”; if(nod.styleSheet){ //ie下 nod.styleSheet.cssText = str; } else { nod.innerHTML = str; //或者写成 nod.appendChild(document.createTextNode(str)) } document.getElementsByTagName(“head”)[0].appendChild(nod);