with(document.all("idSel"))var sValue=options[selectedIndex].value;//等同于var sValue=document.all("idSel").options[selectedIndex].value;with没学过吗？
with的用法在各种语言中大同小异吧？
with(document.all("idSel"))var sValue=options[selectedIndex].value;//等同于var sValue=document.all("idSel").options[selectedIndex].value;with没学过吗？
with的用法在各种语言中大同小异吧？
改为:var sValue=document.all("idSel").options[selectedIndex].value;
就出现错误:'document.all(...).options[...].value'为空或不是对象..
var sValue=document.all("idSel").options[document.all("idSel").selectedIndex].value;
改为:var sValue=document.all("idSel").options[selectedIndex].value;
就出现错误:'document.all(...).options[...].value'为空或不是对象..
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selectedIndex是idSel滴属性，用with时没问题，瞎改当然就错了！要短滴这么写就行了，L@_@K<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title> new document </title>
<meta name="generator" content="editplus" />
<meta name="author" content="Gao YiXiang" />
<meta name="email" content="[email protected]" />
<meta name="keywords" content="javascript dhtml dom" />
<meta name="description" content="I love web development." />
<style>
#idDIV{width:100%;height:80px;background-color:#FFD700;padding:4px;font-family:verdana,tahoma;font-weight:bold;}
</style>
</head>
<body>
<script>
function rdl_change(e)
{
var oDiv=document.all("idDiv");
oDiv.style.fontVariant=document.all("idSel").value;
}
</script><div id=idDIV> Every man dies , Not every man really lives . </div>
<br>
<select id="idSel" onchange="rdl_change();">
<option value="normal"> ---font-variant---
<option value="normal"> normal
<option value="small-caps"> small-caps
</select>
<br>
</body>
</html>