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Jan 24th, 2018
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  1. <!DOCTYPE html>
  2. <html><head>
  3. <meta http-equiv="content-type" content="text/html; charset=utf-8">
  4. <script>
  5. function z(e) {
  6. e.preventDefault();
  7. var log = document.getElementById('log');
  8. log.textContent = log.textContent + "0\n";
  9. }
  10. function p(e) {
  11. e.preventDefault();
  12. var log = document.getElementById('log');
  13. log.textContent = log.textContent + "+\n";
  14. }
  15. function m(e) {
  16. e.preventDefault();
  17. var log = document.getElementById('log');
  18. log.textContent = log.textContent + "-\n";
  19. }
  20.  
  21. function handleEvent(e) {
  22. if ((e.charCode == 32) || (e.charCode == 48)) {
  23. z(e);
  24. } else if (e.charCode == 43) {
  25. p(e);
  26. } else if (e.charCode == 45) {
  27. m(e);
  28. }
  29. }
  30.  
  31. document.addEventListener("keypress", handleEvent, true);
  32. </script>
  33. </head>
  34. <body>
  35. <pre id="log"></pre>
  36. </body>
  37. </html>
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