秒表/计时器，保存var并显示在高分列表(HTML, JS)

Stopwatch / Timer, save var and show in high score list (HTML, JS)

本文关键字：列表 HTML JS 显示 计时器 保存 var 秒表      更新时间：2023-09-26

我正在构建一个需要计时器的web应用程序:在特定事件时启动，停止和重置。之后，我想将变量保存在类似"hilicore"的列表中。

该应用程序应该与AR眼镜一起用于维护工作。

应用程序应该包含测量作业持续时间的功能。

这是与我的问题相关的代码:

JS: 

 var    clsStopwatch = function() {
            // Private vars
            var startAt = 0;    // Time of last start / resume. (0 if not running)
            var lapTime = 0;    // Time on the clock when last stopped in milliseconds
        var now = function() {
                return (new Date()).getTime(); 
            }; 
        // Public methods
        // Start or resume
        this.start = function() {
                startAt = startAt ? startAt : now();
            };
        // Stop or pause
        this.stop = function() {
                // If running, update elapsed time otherwise keep it
                lapTime = startAt ? lapTime + now() - startAt : lapTime;
                startAt = 0; // Paused
            };
        // Reset
        this.reset = function() {
                lapTime = startAt = 0;
            };
        // Duration
        this.time = function() {
                return lapTime + (startAt ? now() - startAt : 0); 
            };
    };
var x = new clsStopwatch();
var $time;
var clocktimer;
var ourTime = 3;
function pad(num, size) {
    var s = "0000" + num;
    return s.substr(s.length - size);
}
function formatTime(time) {
    var h = m = s = ms = 0;
    var newTime = '';
    h = Math.floor( time / (60 * 60 * 1000) );
    time = time % (60 * 60 * 1000);
    m = Math.floor( time / (60 * 1000) );
    time = time % (60 * 1000);
    s = Math.floor( time / 1000 );
    ms = time % 1000;
    newTime = pad(h, 2) + ':' + pad(m, 2) + ':' + pad(s, 2) + ':' + pad(ms, 3);
    return newTime;
}
function show() {
    $time = document.getElementById('time');
    update();
}
function update() {
    $time.innerHTML = formatTime(x.time());
}
function start() {
    clocktimer = setInterval("update()", 1);
    x.start();
}
function stop() {
    x.stop();
    clearInterval(clocktimer);
}
function reset() {
    stop();
    x.reset();
    update();
}
HTML: 

<head>
    <meta charset="UTF-8">
    <title>Stopwatch</title>
</head>
<body onload="show();">
    <div>Time: <span id="time"></span></div>
    <input type="button" value="start" onclick="start();">
    <input type="button" value="stop" onclick="stop();">
    <input type="button" value="reset" onclick="reset()">
</body>

<div id="result"></div>

<script>
  if (typeof(Storage) != "undefined") {
    // Store
    localStorage.setItem("lastname", ourTime);
    // Retrieve
    document.getElementById("result").innerHTML = localStorage.getItem("lastname");
} else {
    document.getElementById("result").innerHTML = "Sorry, your browser does not support Web Storage...";
}

</script>

在这个例子中，值3被保存并正确显示，但是我不能显示秒表停止后的时间。

我想到的最好的是:

var ourTime = formatTime(X)

这将以正确的格式显示数字，但值始终是00:00:00或未定义。我如何得到正确的秒表停止值?

问题是您试图更新未定义的字段;update()中调用的$time值被设置为NULL。为了解决这个问题，我在start()中声明了$time，现在它似乎工作了。此外，您根本没有使用show()函数，所以我只是把它遗漏了，就像localStorage一样，因为它对问题没有贡献，xy没有定义，因此它只是为我们创建了一个错误。

 var clsStopwatch = function() {
   // Private vars
   var startAt = 0; // Time of last start / resume. (0 if not running)
   var lapTime = 0; // Time on the clock when last stopped in milliseconds
   var now = function() {
     return (new Date()).getTime();
   };
   // Public methods
   // Start or resume
   this.start = function() {
     startAt = startAt ? startAt : now();
   };
   // Stop or pause
   this.stop = function() {
     // If running, update elapsed time otherwise keep it
     lapTime = startAt ? lapTime + now() - startAt : lapTime;
     startAt = 0; // Paused
   };
   // Reset
   this.reset = function() {
     lapTime = startAt = 0;
   };
   // Duration
   this.time = function() {
     return lapTime + (startAt ? now() - startAt : 0);
   };
 };
 var x = new clsStopwatch();
 var $time;
 var clocktimer;
 var ourTime = 3;
 function pad(num, size) {
   var s = "0000" + num;
   return s.substr(s.length - size);
 }
 function formatTime(time) {
   var h = m = s = ms = 0;
   var newTime = '';
   h = Math.floor(time / (60 * 60 * 1000));
   time = time % (60 * 60 * 1000);
   m = Math.floor(time / (60 * 1000));
   time = time % (60 * 1000);
   s = Math.floor(time / 1000);
   ms = time % 1000;
   newTime = pad(h, 2) + ':' + pad(m, 2) + ':' + pad(s, 2) + ':' + pad(ms, 3);
   return newTime;
 }
 function update() {
   $time.innerHTML = formatTime(x.time());
 }
 function start() {
   //Declare $time here, so update() knows which field it needs to update
   $time = document.getElementById('time');
   clocktimer = setInterval("update()", 41);
   x.start();
 }
 function stop() {
   x.stop();
   clearInterval(clocktimer);
 }
 function reset() {
   stop();
   x.reset();
   update();
 }
<div>Time: <span id="time"></span></div>
<input type="button" value="start" onclick="start();">
<input type="button" value="stop" onclick="stop();">
<input type="button" value="reset" onclick="reset()">

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