中间页动态加载js文件

$("head").append("<script type='text/javascript' src='Scripts/gmain.js'><//script>");

2、动态改变已有script的src属性
<script src='' id="s1"></script>
<script language="javascript">
    s1.src="test.js"
</script>

3、动态创建script元素
<script>
    var oHead = document.getElementsByTagName('HEAD').item(0);
    var oScript= document.createElement("script");
    oScript.type = "text/javascript";
    oScript.src="test.js";
    oHead.appendChild( oScript);
</script>

function loadDemo(){       var iHead = document.getElementsByTagName('HEAD').item(0);          var iScript= document.createElement("script");          iScript.type = "text/javascript";          iScript.src="demo.js";          iHead.appendChild(iScript);  }

同样的css文件也一样。