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為什么在confirm對話框點取消后仍然會彈出prompt對話框呢

<!DOCTYPE?html>
<html>
?<head>
??<title>?new?document?</title>??
??<meta?http-equiv="Content-Type"?content="text/html;?charset=gbk"/>???
??<script?type="text/javascript">??
????function?openWindow()
????{
????????var?newpage=confirm("要打開新窗口嗎？");
????????if(newpage=true)
????????{
????????????var?url=prompt("請輸入要打開的網(wǎng)址：","http://idcbgp.cn/");
????????????if(url!=null)
????????????{
????????????????window.open(url,'_blank','width=400,height=500,menubar=no,toolbar=no');
????????????}
????????????else
????????????{
????????????????alert("再見！")
????????????}
????????}
????????else
????????{
????????????alert("再見！")
????????}
????}
??</script>?
?</head>?
?<body>?
	??<input?type="button"?value="新窗口打開網(wǎng)站"?onclick="openWindow()"?/>?
?</body>
</html>

請大家?guī)兔纯磫栴}出在哪兒