动态创建style片段和script片段

/** 命名空间 */
var Littlehow = {};
/** 创建script对象 */
Littlehow.script = function(data,head){
var script = document.createElement("script");
script.type = "text/javascript";
if(data){
if(document.all)
script.text = data;
else
script.appendChild(document.createTextNode(data));
}
head = head?head:document.getElementsByTagName("head")[0]||document.documentElement;
head.appendChild(script);
return script;
}
/** 创建style对象 */
Littlehow.style = function(data,head){
var style = document.createElement("style");
style.type = "text/css";
if(document.all){
style.styleSheet.cssText = data;
}else{
style.innerHTML = data;
}
head = head?head:document.getElementsByTagName("head")[0]||document.documentElement;
head.appendChild(style);
return style;
}