text: window.DefineScript('Timer', { author: 'T.P Wang' });
  
  // This sample create two timers
  // Click the window to start the timer, and see the result after the console is shown.
  // Click the window again to kill all timers.
  
  let g_timer_started = false;
  let g_count = 0;
  let g_timer1_ID = 0, g_timer2_ID = 0;
  
  function print_to_console(msg) {
      console.log('Timer test:', msg);
  }
  
  function on_mouse_lbtn_up() {
      if (!g_timer_started) {
          // Timer are created here
          // 2s - one shot, happens after 2000 ms, only once
          g_timer1_ID = setTimeout(() => {
              // Print and show console
              fb.ShowConsole();
              print_to_console('g_timer1: Show console now.');
          }, 2000);
  
          // 500ms - periodic, happens every 500 ms
          g_timer2_ID = setInterval(() => {
              g_count++;
              print_to_console('g_timer2: ' + g_count + ' time(s).');
          }, 500);
  
          g_timer_started = true;
      }
      else {
          // Kill all timers
          clearTimeout(g_timer2_ID);
          clearInterval(g_timer1_ID);
          g_timer_started = false;
          g_count = 0;
          print_to_console('Timers killed.');
      }
  }
  