Perl 一个简单的 GUI 程序，有退出按钮
#!/usr/bin/perl -w
use Tk;

$Tk::strictMotif = 1;

$main = MainWindow->new();

$button1 = $main->Button(-text => "Exit",
-command => \&exit_button,
-foreground => "orangered" );

$button1->pack();
$button1->configure(-background => "white" );
$button2 = $main->Button(-text => "Push Me",
-command => \&change_color,
-foreground => "black",
-background => "steelblue");

$button2->pack();

MainLoop();

sub exit_button {
print "You pushed the button!\n";
exit;
}

sub change_color {
$button1->configure(-background => "red",
-foreground => "white");
$button2->configure(-background => "maroon",
-foreground => "white",
-font => "-*-times-bold-r-normal-20-140-*");
}