1． showModalDialog和showModelessDialog的異同
同：兩者彈出的表單不能重新整理
異：前者是模態視窗，始終獲得焦點；後者是非模態視窗，只不過彈出一個頁面，還可以操作父視窗。
2． 關閉showModalDialog和showModelessDialog彈出的視窗
<INPUT type="button" value="ButtonClick" onclick="self.close();">
3． 怎樣才讓在showModalDialog和showModelessDialog的彈出新視窗裡操作button,不彈出新視窗？
在<head>和</head>之間加<base target="_self">
4. showModalDialog的傳回值
參照例子：
t1.html:
<script language="javascript">
function showpage()
{
alert(showModalDialog("t2.html"));
}
</script>
<input type="button" value="getval" onClick="showpage();">
t2.html
<HTML>
<HEAD>
<Script language="javascript">
<
function SetVal()
{
returnValue="abc";
close();
}
//-->
</Script>
</HEAD>
<BODY>
<input type="button" value="Btn1" onClick="SetVal();">
</BODY>
</HTML>
轉自：http://hi.baidu.com/bai_net/blog/item/94c648606d044fdc8cb10dc2.html
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