Created
March 31, 2017 02:20
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| <!doctype html> | |
| <html lang="pt-br"> | |
| <head> | |
| <meta charset="utf-8"> | |
| </head> | |
| <body> | |
| <input type="text" readonly="readonly" name="numbers"> | |
| <button id="plus" onclick="plus()">+</button> | |
| <button id="minus" onclick="minus()">-</button> | |
| <script> | |
| var counter = 0; | |
| var numbers = document.getElementsByName('numbers')[0]; | |
| numbers.value = counter; | |
| var minimumValue = 0; | |
| var maximumValue = 10; | |
| function plus() { | |
| var currentValue = parseFloat(numbers.value) + 0.5; | |
| if (currentValue > maximumValue) { | |
| currentValue = maximumValue; | |
| } | |
| numbers.value = currentValue; | |
| } | |
| function minus() { | |
| var currentValue = parseFloat(numbers.value) - 0.5; | |
| if (currentValue < minimumValue) { | |
| currentValue = minimumValue; | |
| } | |
| numbers.value = currentValue; | |
| } | |
| </script> | |
| </body> | |
| </html> |
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