一个秒级别计数器:点击“开始"按钮从0开始每隔1秒计数,点击"停止"按钮停止计数。计数停止后,再次点击"开始"按钮继续计数。
效果:
代码:
<button onclick="myCounter.startCount()">开始</button>
<input id="counter" type="text" readonly="readonly">
<button onclick="myCounter.stopCount()">停止</button>
<button onclick="myCounter.resetCount()">重置</button>
<script>
var myCounter = (function () {
var step = 0;
var intervalId = null;
function count() {
document.getElementById("counter").value = step;
step = step + 1;
}
function start() {
if (intervalId == null) {
count();
intervalId = setInterval(count, 1000);
}
}
function stop() {
clearInterval(intervalId);
intervalId = null;
}
function reset() {
stop();
step = 0;
document.getElementById("counter").value = "";
}
return { startCount: start, stopCount: stop, resetCount: reset }
})()
</script>