使用JavaScript定义打开网页后居中显示，并可为窗口设置大小，使用“window.open”方法打开新窗口：先来看完整的代码及调用方法：
<html xmlns="http://www.w3.org/1999/xhtml" > <head> <title>打开居中的窗口</title> <script language="javascript"> //参数-url：要打开的网站，winname：打开后的窗体名称 //参数打开新窗体的宽度，height：打开新窗体的高度 <!-- 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>
代码的重点是设置打开窗口的一些属性，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。