我的目标是calcyear (cyear)最初从值"8“开始。每当天数达到364,我希望从这个8值中减去一个值"1“,直到它达到零。
由于某些原因,p id似乎无法识别calcyear id...或者也许是这样,但是代码是错误的?
完整代码:
<html>
<style>
#countup p {
display: inline-block;
padding: 0px;
margin: 0 0 10px;
}
#paragraph2 p {
display: inline-block;
padding: 0px;
margin: 0 0 10px;
}
</style>
<div id="countup">
We are in day
<p id="days">00</p>
<p class="timeRefDays">of the calendar. This day has been going on for </p>
<p id="hours">00</p>
<p class="timeRefHours">hours, </p>
<p id="minutes">00</p>
<p class="timeRefMinutes">minutes, and </p>
<p id="seconds">00</p>
<p class="timeRefSeconds"> seconds.</p>
</div>
<div id="paragraph2">
<p>We are in month</p>
<p id="months">00</p>
<p>of the year.</p>
</div>
<div id="paragraph2">
<p>In </p>
<p id="calcyear">0</p>
<p> years an intercalation week will be added.</p>
</div>
<script>
window.onload=function() {
upTime('mar,20,2016,00:00:00');
}
function upTime(countTo) {
now = new Date();
countTo = new Date(countTo);
difference = (now-countTo);
days=Math.floor(difference/(60*60*1000*24)*1);
hours=Math.floor((difference%(60*60*1000*24))/(60*60*1000)*1);
mins=Math.floor(((difference%(60*60*1000*24))%(60*60*1000))/(60*1000)*1);
secs=Math.floor((((difference%(60*60*1000*24))%(60*60*1000))%(60*1000))/1000*1);
mons=Math.floor(difference/(24*60*60*1000*24)*1);
cyear= 8
years=Math.floor(days / 364)
if (years > 1){ cyear = cyear - 1}
document.getElementById('days').firstChild.nodeValue = days;
document.getElementById('hours').firstChild.nodeValue = hours;
document.getElementById('minutes').firstChild.nodeValue = mins;
document.getElementById('seconds').firstChild.nodeValue = secs;
document.getElementById('months').firstChild.nodeValue = mons;
document.getElementById('years').firstChild.nodeValue = years;
document.getElementById('calcyear').firstChild.nodeValue = cyear;
clearTimeout(upTime.to);
upTime.to=setTimeout(function(){ upTime(countTo); },1000);
}
</script>
</html>发布于 2016-07-06 09:27:22
没有id为years的元素,所以您的代码到此为止。
只需将<p id="years">0</p>添加到您的代码中,它就会运行。
发布于 2016-07-06 09:27:41
问题出在下面这段代码上:
document.getElementById('years').firstChild.nodeValue = years;在你的超文本标记语言中没有id为'years'的元素,因此你会收到错误信息:
未捕获TypeError:无法读取null的属性'firstChild‘
由于不存在id为'years'的元素,因此document.getElementById('years')将返回null。此错误还会停止执行,因此下一行将不会运行。所以因为它是在那个calcyear没有更新之后。
document.getElementById('years').firstChild.nodeValue = years; // Stops
document.getElementById('calcyear').firstChild.nodeValue = cyear; // Not ran您似乎打算添加它,但可能忘记了:
<div id="paragraph2">
<p>We are in month</p>
<p id="months">00</p>
<p>of the year </p>
<p id="years">00</p> <!-- Added line -->
</div>https://stackoverflow.com/questions/38215005
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