timer--计时器

<!DOCTYPE html>

<html>

<head>

    <meta charset="utf-8" />

    <title>timer-计时器</title>

    <style>

        div{

            width:300px;

            margin:0 auto;

            padding-top:60px;

        }

        #timer{

            font-size:30px;

            text-align:center;

        }

        #start{

            font-weight:bold;

        }

    </style>

    <script>

        var intervalId,   //setInterval的id

            pattern = /^\d$/,  //正则模式，匹配单个数值

            intervalSeconds = 1000, //调用setInterval的间隔时间，设置为 1000 毫秒，即 1 秒

            secondIncrement = 0;   //设置秒递增器起始值为 0 

        //注册页面加载事件

        window.onload = function () {

            var start = document.getElementById("start");

            var timer = document.getElementById("timer");

            function handleTimer() {

                if (!intervalId) {

                    intervalId = setInterval(function () {

                        secondIncrement++;    
　　　　　　　　　　　　　　//定义一个Date对象实例

                        var someDate = new Date("1111/1/1,0:0:0");
　　　　　　　　　　　　　　//设置秒数，当secondIncrement值超过59时，则分钟数会加1

                        someDate.setSeconds(secondIncrement);

                        var hours = someDate.getHours();

                        hours = pattern.test(hours) ? "0" + hours + ":" : hours + ":";

                        var minutes = someDate.getMinutes();

                        minutes = pattern.test(minutes) ? "0" + minutes + ":" : minutes + ":";

                        var seconds = someDate.getSeconds();

                        seconds = pattern.test(seconds) ? "0" + seconds : seconds;

                        timer.value = hours + minutes + seconds;

                    }, intervalSeconds);

                    this.innerHTML = "Pause";

                } else {

                    clearInterval(intervalId);

                    intervalId = null;

                    this.innerHTML = "Start";

                }

            }

            start.addEventListener("click", handleTimer, false);

        }

    </script>

</head>

<body>

    <div>

        <p><input type="text" id="timer" value="00:00:00"  readonly/></p>

        <button id="start">Start</button>

    </div>

</body>

</html>
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timer--计时器

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