你好，请问用JavaScript如何改变<ifrema>的宽和高属性？

Question

<iframe id="ifrTest" src="" width="580" height="399" scrolling="no" name="Web"> </iframe>document.getElementById('ifrTest').setAttribute('width','250px');
document.getElementById('ifrTest').setAttribute('height','250px');

Answer 1

<iframe src="" width="580" height="399" scrolling="no" name="Web"> </iframe>
<script>
    function $(id){return document.getElementsByTagName("iframe")[id]}
    $(0).style.width = 250;
    $(0).style.height = 250;
</script>

Answer 2

<iframe src="http://www.zishu.cn" name="content" height="200" width="468" scrolling="no" id="content" frameborder="0"></iframe><script>   
function iframes(){
 content.location= 'http://www.zishu.cn/m.html'; 
 document.getElementById('content').height= 500;
 document.getElementById('content').width= 1000; 
}
</script>