popup.js

这是《JavaScript学习源代码》一书的源代码

// variable to store a window object
var popwin = null;

// a function to open a pop-up window
function open_popup()
{
  if(popwin == null)
  popwin = window.open( "pop.html", "","top=100,left=80,width=250,height=100,status");
} 

// function to close a pop-up window
function close_popup()
{ 
    if(popwin != null){ popwin.close(); popwin = null; }
}