如何动态在文档中加入＜script＞＜/script＞写入大段js

<script language="javascript">

var script = document.createElement("script");

script.language = "javascript";

script.text = "alert('hello world!')";

document.body.appendChild(script);

</script>

另一方法：
http://www.cnblogs.com/webqiand/p/4200414.html