动态加载或执行js

Base.Script={
    
    create:function(obj,contain,name)
    {
        if(!name)
        {
            var date=new Date();
            name=date.getTime();
        }
        contain=$(contain)?$(contain):document.body;
        var script=document.createElement("script");
        script.id=name;
        if(typeof(obj)=="string")
        {
            var src=obj.match(/^<script[^>]+?scr=([^\s>]+)/i);
            if(src)
            {
                script.src=src;
            }
            else
            {
                script.text=obj;
            }
        }
        if(typeof(obj)=="object")
        {
            if(obj.src)
                script.src=obj.src;
            else
                script.text=obj.innerHTML;
        }
        contain.appendChild(script);
        return name;
    }
}

//动态载入一个js文件
Base.Script.create({src:"/js/abc.js"})

//动态执行一个js块
<script type="text/javascript" id="js1">
alert(2);
</script>
Base.Script.create($("js"));

//动态插入一段脚本
Base.Script.create("alert(2)");

有什么不足之处请指出.......