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- <!DOCTYPE html>
- <html><head>
- <meta http-equiv="content-type" content="text/html; charset=utf-8">
- <script>
- function z(e) {
- e.preventDefault();
- var log = document.getElementById('log');
- log.textContent = log.textContent + "0\n";
- }
- function p(e) {
- e.preventDefault();
- var log = document.getElementById('log');
- log.textContent = log.textContent + "+\n";
- }
- function m(e) {
- e.preventDefault();
- var log = document.getElementById('log');
- log.textContent = log.textContent + "-\n";
- }
- function handleEvent(e) {
- if ((e.charCode == 32) || (e.charCode == 48)) {
- z(e);
- } else if (e.charCode == 43) {
- p(e);
- } else if (e.charCode == 45) {
- m(e);
- }
- }
- document.addEventListener("keypress", handleEvent, true);
- </script>
- </head>
- <body>
- <pre id="log"></pre>
- </body>
- </html>
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