我是新来的，我正在尝试为自己编写一些代码。我在这段代码中有自己的“时钟”。然后我指定一个确切的时间。然后我想用毫秒减去我在实际时间（如计时器或倒计时）之前指定的确切时间。但我真的不知道怎么做。到目前为止，这是我的代码：<!DOCTYPE html><html><head><title>DSTimer</title></head><body><center><font face="Verdana" size="40">DS-Timer</font><br /></center><br /><br /><font size="+7" </font><p id="DS-Timer">getElementById</p><font size="-1" </font><p id="ABC"></p><font size="+1" </font> <label class="h2" for="delay">Verbindungszeit zum Server</label> <input type="number" name="Verbindungszeit zum Server" id="delay" maxlength="3"> <button onclick="addDelay()" type="submit">OK</button> <p> <label for="Abschickzeitpunkt">Abschickzeitpunkt</label> <input type="time" step="0.001" id="ABZ"> <button onclick="insert()" type="submit">OK</button></p> <button type="reset">Eingaben zurücksetzen</button></form></body><script>var delay = 0;timer();function timer() { var now = new Date(); var test = new Date(now.getTime() + delay), h = test.getHours(), m = test.getMinutes(), s = test.getSeconds(), ms = test.getMilliseconds(); m = zeroFill(m); s = zeroFill(s); ms = zeroFill(ms); document.getElementById('DS-Timer').innerHTML = h + ':' + m + ':' + s + ':' + ms; setTimeout(timer, 5);}function zeroFill(filler) { filler = (filler < 10 ? '0' : '') + filler; return filler;}function addDelay() { var d = document.getElementById('delay').value; delay = parseFloat(d);}function insert() { var x = document.getElementById("ABZ").value document.getElementById("ABC").innerHTML = x; } </script></html>```So I want to calculate "DS-Timer - ABC".
2 回答
慕哥6287543
TA贡献1831条经验 获得超10个赞
您可以在大多数现代 Javascript 引擎中使用 Performance 接口。
let start = performance.now();
let timer = document.getElementById("timer");
for(let i = 0;i<5000;i++){
timer.innerText = i;
}
let end = performance.now();
let elapsed = end - start;
timer.innerText += " that took "+elapsed+" ms"
<h1 id="timer"></h1>
胡说叔叔
TA贡献1804条经验 获得超8个赞
这就是它的工作原理。:-)
var z = (document.getElementById("ABZ").value).split(':').join(',').split('.').join(',').split(',').join(',').split(',');
var y = new Date();
var generatedDate = new Date(y.getFullYear(), y.getMonth(),y.getDate(),z[0], z[1], z[2], z[3], z[4], z[5]);
var calculatedDate = generatedDate - y;
var h = Math.floor((calculatedDate % (1000 * 60 * 60 * 24)) / (1000 * 60 * 60));
var m = Math.floor((calculatedDate % (1000 * 60 * 60)) / (1000 * 60));
var s = Math.floor((calculatedDate % (1000 * 60)) / 1000);
var ms = Math.floor((calculatedDate % 1000));
document.getElementById("COUNTDOWN").innerHTML = ( h + ':' + m + ':' + s + ':' + ms);```
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