images 集合可返回对文档中所有 Image 对象的引用。
document.images[]
例子
<html>
<body>
<img border="0" src="hackanm.gif" width="48" height="48">
<br />
<img border="0" src="compman.gif" width="107" height="98">
<br /><br />
<script type="text/javascript">
document.write("This document contains: ")
document.write(document.images.length + " images.")
</script>
</body>
</html>