Javascript 秒表不从零开始
我这里有一个基本的秒表，但问题是我认为它在页面加载时开始计数，而不是在单击开始按钮时开始计数。同样，当您重置并重新启动时，也会发生同样的问题。
<form>
<input type="button" value="Start count!" onclick="doTimer()" />
<input type="text" id="txt" />
<input type="button" value="Stop count!" onclick="stopCount()" />
<input type="button" value="Reset!" onclick="resetCount()" />
</form>
<script type="text/javascript">
var start = new Date().getTime();
var elapsed = '0.0';
var t;
var timer_is_on=0;
function timedCount() {
var time = new Date().getTime() - start;
elapsed = Math.floor(time / 100) / 10;
if(Math.round(elapsed) == elapsed) { elapsed += '.0'; }
document.getElementById('txt').value=elapsed;
t=setTimeout("timedCount()",50);
}
function doTimer() {
if (!timer_is_on) {
timer_is_on=1;
timedCount();
}
}
function stopCount() {
clearTimeout(t);
timer_is_on=0;
}
function resetCount() {
document.getElementById('txt').value='0.0';
var elapsed = '0.0';
}
</script>
我尝试定义开始按钮的开始变量 onclick，但到目前为止还没有取得太大成功。非常感谢任何帮助，谢谢。
I've got a basic stopwatch here, but the problem is I think it begins counting when the page loads as opposed to when the start button is clicked. Likewise, when you reset and start again the same problem happens.
<form>
<input type="button" value="Start count!" onclick="doTimer()" />
<input type="text" id="txt" />
<input type="button" value="Stop count!" onclick="stopCount()" />
<input type="button" value="Reset!" onclick="resetCount()" />
</form>
<script type="text/javascript">
var start = new Date().getTime();
var elapsed = '0.0';
var t;
var timer_is_on=0;
function timedCount() {
var time = new Date().getTime() - start;
elapsed = Math.floor(time / 100) / 10;
if(Math.round(elapsed) == elapsed) { elapsed += '.0'; }
document.getElementById('txt').value=elapsed;
t=setTimeout("timedCount()",50);
}
function doTimer() {
if (!timer_is_on) {
timer_is_on=1;
timedCount();
}
}
function stopCount() {
clearTimeout(t);
timer_is_on=0;
}
function resetCount() {
document.getElementById('txt').value='0.0';
var elapsed = '0.0';
}
</script>
I've tried defining the start variable onclick of the start button but not had much success so far. Any help is much appreciated thank you.
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您必须在
doTimer()中包含另一个重置：请在此处。
You'll have to include another reset in
doTimer():See the running version here.
您遇到的问题是您在页面加载后立即记录
开始，而不是在用户实际单击开始按钮时记录。要记录用户实际单击按钮时的开始，请将doTimer函数更改为以下内容The problem you're having is your recording the
startas soon as the page loads instead of when the user actually clicks on the start button. To record the start when the user actually clicks on the button change yourdoTimerfunction to the folowing