javascript如何自动关闭窗口

function CloseWin() //这个不会提示是否关闭浏览器    
{    
window.opener=null;    
//window.opener=top;    
window.open("","_self");    
window.close();    
}

function open_complex_self() {    
  var obj_window = window.open('close.html', '_self');    
  obj_window.opener = window;    
  obj_window.focus();    
 }

window.close();

//普通带提示关闭
function closeie(){
window.close();
}
//关闭IE6不提示
function closeie6(){
window.opener=null;
window.close();
}
//关闭IE7不提示
function closeie7(){
window.open('','_top');
window.top.close();
}