Question

我正在尝试创建倒计时器，如果用户在中间停止计时器，则在完成时间后提交表单，然后我必须计算剩余时间。这是我的代码。

<html>
    <head>
        <meta charset="UTF-8">
        <title></title>
    <script type="text/javascript">
        var total_seconds = 600;
        var c_minutes=parseInt(total_seconds/60);
        var c_seconds=parseInt(total_seconds%60);
        var hours=parseInt(total_seconds/3600);
        function CheckTime(){
        document.getElementById('time-left').innerHTML='Time Left: '+hours+' hours '+c_minutes+' min '+c_seconds+' sec';
        if(total_seconds<=0){
            alert("oops no time left");
            setTimeout('document.form.submit()',1);
        }else{
            total_seconds=total_seconds-1;
            c_minutes=parseInt(total_seconds/60);
            c_seconds=parseInt(total_seconds%60);
            hours=parseInt(total_seconds/3600);
            setTimeout("CheckTime()",1000);
        }
        }
        var timeout = setTimeout("CheckTime()",1000);
        setInterval(function() {
        console.log('Time left: '+getTimeLeft(timeout)+'s');
        }, 2000);
        function getTimeLeft(timeout) {
        return Math.ceil((timeout._idleStart + timeout._idleTimeout - Date.now()) / 1000);
        }
    </script>
    </head>
    <body>
    <h1>Countdown Timer</h1>
    <div id="time-left"> </div>
    <br/><br/>
    <form method="post" name="form" action="timer.php"></form>
     <button onclick="getTimeLeft()">Stop</button>
    </body>
</html>

Answer 1

感谢Leopard，我明白了。

<html>
    <head>
        <meta charset="UTF-8">
        <title></title>
    <script type="text/javascript">
        var total_seconds = 600;
        var c_minutes=parseInt(total_seconds/60);
        var c_seconds=parseInt(total_seconds%60);
        var hours=parseInt(total_seconds/3600);
        function CheckTime(){
        document.getElementById('time-left').innerHTML='Time Left: '+hours+' hours '+c_minutes+' min '+c_seconds+' sec';
        if(total_seconds<=0){
            alert("oops no time left");
            setTimeout('document.form.submit()',1);
        }else{
            total_seconds=total_seconds-1;
            c_minutes=parseInt(total_seconds/60);
            c_seconds=parseInt(total_seconds%60);
            hours=parseInt(total_seconds/3600);
            console.log(total_seconds);
            setTimeout("CheckTime()",1000);
        }
        }
        setTimeout("CheckTime()",1000);

    </script>
    </head>
    <body>
    <h1>Countdown Timer</h1>
    <div id="time-left"> </div>
    <br/><br/>
    <form method="post" name="form">
        <input type="submit" name="sub" id="submt" value="Save">
    </form>
    </body>
</html>

Answer 2

您可以简单地使用变量total_seconds来获取剩余时间（以秒为单位），因为它已经在seconds中并且每两秒后更新一次。

var timeout = setTimeout("CheckTime()",1000);
        setInterval(function() {
        console.log('Time left: '+total_seconds+'s');
        }, 2000);

如何从倒数计时器中获取剩余时间？

2 个答案: