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