Created
September 10, 2014 03:31
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JS Time Counter
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| <!doctype html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"/> | |
| </head> | |
| <body> | |
| <p>Minute : <span id="minute">0</span></p> | |
| <p>Second : <span id="second">0</span></p> | |
| <script type="text/javascript"> | |
| var second = 0; | |
| var showMinute = document.querySelector("#minute"); | |
| var showSecond = document.querySelector("#second"); | |
| var lastCounterState = localStorage.getItem("lastCounterState"); | |
| if (lastCounterState != null) { | |
| lastCounterState = JSON.parse(lastCounterState) | |
| var currentTime = (new Date()).getTime() | |
| var diffTime = Math.round((currentTime - lastCounterState.lastTime) / 1000.0); | |
| second = lastCounterState.lastCounter + diffTime; | |
| showMinute.innerHTML = Math.floor(second / 60); | |
| showSecond.innerHTML = second % 60; | |
| } | |
| var counterInterval = setInterval(function() { | |
| second++; | |
| showMinute.innerHTML = Math.floor(second / 60); | |
| showSecond.innerHTML = second % 60; | |
| },1000); | |
| window.onbeforeunload = function(event) { | |
| clearInterval(counterInterval); | |
| var currentState = {lastCounter : second, lastTime : (new Date()).getTime()}; | |
| localStorage.setItem("lastCounterState", JSON.stringify(currentState)); | |
| }; | |
| </script> | |
| </body> | |
| </html> |
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