让打开的窗口居中
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title>标题页</title>
<script language="javascript">
//参数-url表示要打开的网站，winname表示打开后的窗体名称
//参数windth表示打开窗体的宽度，height表示打开窗体的高度
<!--
function openwindow( url,winName,width,height)
{
xposition=0; yposition=0;
if ((parseInt(navigator.appVersion) >= 4 ))
{
xposition = (screen.width - width) / 2; //窗体居中的x坐标
yposition = (screen.height - height) / 2; //窗体居中的y坐标
}
theproperty= "width=" + width + "," //打开窗口的属性
+ "height=" + height + ","
+ "location=0,"
+ "menubar=0,"
+ "resizable=1,"
+ "scrollbars=0,"
+ "status=0,"
+ "titlebar=0,"
+ "toolbar=0,"
+ "hotkeys=0,"
+ "screenx=" + xposition + "," //仅适用于Netscape
+ "screeny=" + yposition + "," //仅适用于Netscape
+ "left=" + xposition + "," //IE
+ "top=" + yposition; //IE
window.open( url,winName,theproperty ); //打开窗口
}//-->
</script>
</head>
<body>
<a href="javascript:openwindow('http://www.google.com','openwin',300,300)">
打开窗口</a></body>
</html>
本例的重点是设置打开窗口的一些属性。“window.open”方法用来打开窗口，此方法的三个参数分别代表：要打开窗口的URL、打开窗口的名字、打开窗口的一些属性（如是否有滚动条、最大化按钮等）。本例使用“(screen.width-width)/2”和“(screen.height-height)/2”获取窗体居中的坐标点，然后指定窗体的“left”和“top”属性。