JavaScript实现自动弹出并关闭窗口的示例

<HTML>
<HEAD>
<TITLE>自动离开的窗口</TITLE>
<SCRIPT>
<!--
var flyingwin
var popupwidth=200
var popupheight=150
var marginright
var windowcenter
var i_top=200
var i_left=-popupwidth-50
var step=40
var timer
var waitingtime=5000
var pause=20
function showWindow() {
 flyingwin = window.open("", "flyingwin", "toolbar=no,width="+popupwidth+",height="+popupheight+",top=100,left="+(-popupwidth)+"");
 flyingwin.document.open();
 flyingwin.document.write("<html><title>自动离开的窗口</title><body><p align=center>请不要关闭，马上就离开:(</body></html>");
 flyingwin.document.close();
 if (document.all) {
  marginright = screen.width+50
 }
 if (document.layers) {
  marginright = screen.width+50
 }
 windowcenter=Math.floor(marginright/2)-Math.floor(popupwidth/2)
 movewindow()
}
function movewindow() {
  if (i_left<=windowcenter) {
   flyingwin.moveTo(i_left,i_top)
   i_left+=step
   timer= setTimeout("movewindow()",pause)
  }
  else {
   clearTimeout(timer)
   timer= setTimeout("movewindow2()",waitingtime)
  }
}
function movewindow2() {
  if (i_left<=marginright) {
   flyingwin.moveTo(i_left,i_top)
   i_left+=step
   timer= setTimeout("movewindow2()",pause)
  }
  else {
   clearTimeout(timer)
   flyingwin.close()
  }
}
// -->
</SCRIPT>
</HEAD>
<BODY onload=showWindow()> </BODY>
</HTML>