选择下拉框时如何取选项的值?

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>select</title>
<script type="text/javascript">

</script>
</head>
<body id="body">
<select onchange="alert(this.options[this.selectedIndex].value);">
	<option value="1">a</option>
	<option>b</option>
	<option>c</option>
</select>
</body>
</html>



上面是个demo   

javascript:document.getElementById('reny').value=this.options[this.selectedIndex].innerHTML; 这是取选项的html



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