blocks|key|4035824|text|Momentjs+diff是这里的关键函数：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4035825|var+dayDifference+=+10;

var+d+=+new+Date();
var+momentDate+=+moment(d);

$('p.para').each(function+(index,+element)+{
++++var+date+=+moment($(this).text().trim(),+'M/D/YYYY');
++++if+(momentDate.diff(date,+'days')+<+dayDifference)+{
++++++++//+display+alert
++++}
}|code-block|syntax|javascript|4035826|这可以应用于您提供的html示例：|4035827|<p+class="para">+23/05/2021+</p>
<p+class="para">+19/12/1999+</p>+|4035828|entityMap|0|LINK|mutability|MUTABLE|url|https://momentjs.com/docs/#/displaying/difference/^0|9|4|0|D|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@$9|X|A|Y|B|C]]|D|@$9|Z|A|10|1|11]]|E|$]]|$1|F|3|G|5|H|7|12|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|13|8|@]|D|@]|E|$]]|$1|M|3|N|5|H|7|14|8|@]|D|@]|E|$I|J]]|$1|O|3|-4|5|6|7|15|8|@]|D|@]|E|$]]]|P|$Q|$5|R|S|T|E|$U|V]]]]

<p><a href="https://momentjs.com/docs/#/displaying/difference/" rel="nofollow noreferrer">Momentjs <code>diff</code></a> is the key function here:</p>

<pre><code>var dayDifference = 10;

var d = new Date();
var momentDate = moment(d);

$('p.para').each(function (index, element) {
    var date = moment($(this).text().trim(), 'M/D/YYYY');
    if (momentDate.diff(date, 'days') &lt; dayDifference) {
        // display alert
    }
}
</code></pre>

<p>This can be applied to html example you provided:</p>

<pre><code>&lt;p class="para"&gt; 23/05/2021 &lt;/p&gt;
&lt;p class="para"&gt; 19/12/1999 &lt;/p&gt; 
</code></pre>


blocks|key|4035885|text|编辑：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4035886|下面的代码从html获取日期文本，将其解析为月、日和年，然后将其转换为js+date对象，以便与当前日期进行比较。输出的日期差值从毫秒转换为天数。|4035887|​|4035888|const+dates+=+$('.para');
dates.each((i,+elem)+=>+{
++const+[m,+d,+y]+=+$(elem).text().split('/');
++const+dt+=+new+Date(y,+m+-+1,+d);
++const+diff+=+Math.floor((dt+-+new+Date())+/+(86400+*+1000));
++console.log('date:',+$(elem).text(),+'days+diff+vs+today:',+diff);
});|code-block|syntax|javascript|4035889|<script+src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<p+class="para">05/23/2021</p>
<p+class="para">12/19/1999</p>|4035890|4035891|原始(在删除moment.js代码并将html添加到问题中的编辑之前)：|4035892|您可以使用vanilla+js解析html中的日期文本并将其转换为js+date对象，从而获得以天为单位的日期差，这样您就可以进行一些数学运算，将毫秒差转换为天数(在下面的示例中四舍五入为整日)。|4035893|下面示例中的dates数组是您将从html中选择的日期元素集合的占位符(如果您正在使用table或p元素，从您的问题/评论中不能确定)。用于演示的工作代码片段：|offset|length|style|CODE|4035894|4035895|const+dates+=+['05/23/2021',+'12/19/1999'];
for+(const+date+of+dates)+{
++const+[m,+d,+y]+=+date.split('/');
++const+dt+=+new+Date(y,+m+-+1,+d);
++const+diff+=+Math.floor((dt+-+new+Date())+/+(86400+*+1000));
++console.log('date:',+date,+'days+diff+vs+today:',+diff);
}|4035896|4035897|entityMap^0|0|0|0|0|0|0|0|0|6|5|17|5|1D|1|0|0|0|0^^$0|@$1|2|3|4|5|6|7|13|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|14|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|15|8|@]|9|@]|A|$]]|$1|F|3|G|5|H|7|16|8|@]|9|@]|A|$I|J]]|$1|K|3|L|5|H|7|17|8|@]|9|@]|A|$I|J]]|$1|M|3|E|5|6|7|18|8|@]|9|@]|A|$]]|$1|N|3|O|5|6|7|19|8|@]|9|@]|A|$]]|$1|P|3|Q|5|6|7|1A|8|@]|9|@]|A|$]]|$1|R|3|S|5|6|7|1B|8|@$T|1C|U|1D|V|W]|$T|1E|U|1F|V|W]|$T|1G|U|1H|V|W]]|9|@]|A|$]]|$1|X|3|E|5|6|7|1I|8|@]|9|@]|A|$]]|$1|Y|3|Z|5|H|7|1J|8|@]|9|@]|A|$I|J]]|$1|10|3|E|5|6|7|1K|8|@]|9|@]|A|$]]|$1|11|3|-4|5|6|7|1L|8|@]|9|@]|A|$]]]|12|$]]

<p>EDIT:</p>
<p>The following gets the date text from your html, parses it into month, day, and year, and then converts it to a js date object to be compared to the current date. The date difference is converted from milliseconds to days for output.</p>
<p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
<div class="snippet-code">
<pre class="snippet-code-js lang-js prettyprint-override"><code>const dates = $('.para');
dates.each((i, elem) =&gt; {
  const [m, d, y] = $(elem).text().split('/');
  const dt = new Date(y, m - 1, d);
  const diff = Math.floor((dt - new Date()) / (86400 * 1000));
  console.log('date:', $(elem).text(), 'days diff vs today:', diff);
});</code></pre>
<pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"&gt;&lt;/script&gt;
&lt;p class="para"&gt;05/23/2021&lt;/p&gt;
&lt;p class="para"&gt;12/19/1999&lt;/p&gt;</code></pre>
</div>
</div>
</p>
<p>ORIGINAL (before edits that removed moment.js code and added the html to the question):</p>
<p>You can get the date difference in days using vanilla js by parsing the date text from your html and converting to js date objects so you can do a little math to convert the difference in milliseconds to days (rounded to whole days in the example below).</p>
<p>The <code>dates</code> array in the example below is a placeholder for the collection of date elements you would select from your html (wasn't sure from your question / comments if you are working with a <code>table</code> or with <code>p</code> elements). Working snippet to illustrate:</p>
<p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
<div class="snippet-code">
<pre class="snippet-code-js lang-js prettyprint-override"><code>const dates = ['05/23/2021', '12/19/1999'];
for (const date of dates) {
  const [m, d, y] = date.split('/');
  const dt = new Date(y, m - 1, d);
  const diff = Math.floor((dt - new Date()) / (86400 * 1000));
  console.log('date:', date, 'days diff vs today:', diff);
}</code></pre>
</div>
</div>
</p>


blocks|key|4035949|text|您可以使用moment.diff函数。请遵循这些docs+for+moment+difference，以便更好地理解。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4035950|示例JS：|4035951|let+d+=+moment(inputDate,+'M/D/YYYY');

if+(+d.isValid()+)+{
++++let+differenceInDays+=+moment().diff(d,+'days',+true);++//+moment()+gives+current+date+time.

++++if+(differenceInDays+>+0)+{
++++++++console.log("Past+current+Date");
++++}

}|code-block|syntax|javascript|4035952|entityMap|0|LINK|mutability|MUTABLE|url|http://momentjs.com/docs/#/displaying/difference/^0|5|B|O|Q|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]]|D|@$9|X|A|Y|1|Z]]|E|$]]|$1|F|3|G|5|6|7|10|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|11|8|@]|D|@]|E|$K|L]]|$1|M|3|-4|5|6|7|12|8|@]|D|@]|E|$]]]|N|$O|$5|P|Q|R|E|$S|T]]]]

<p>You can use <code>moment.diff</code> function. Follow these <a href="http://momentjs.com/docs/#/displaying/difference/" rel="nofollow noreferrer">docs for moment difference</a>, for better understanding.</p>

<p>Sample JS:</p>

<pre><code>let d = moment(inputDate, 'M/D/YYYY');

if ( d.isValid() ) {
    let differenceInDays = moment().diff(d, 'days', true);  // moment() gives current date time.

    if (differenceInDays &gt; 0) {
        console.log("Past current Date");
    }

}
</code></pre>


<p>So now I'm just trying to get the dates from the para class to print to the console. Jquery and moment are both working fine. Right now this logs nothing to the console. I need to see if the current date is x days after any of the dates with a class of para. At this point I would be happy with just logging the class dates to the console.</p>

<p>js</p>

<pre><code>        const dates = $('.para');

        dates.each((i, elem) =&gt; {
         let parts = $(elem).text().split('/');
           let dt = new Date(parts[2] ,parts[1], parts[0]).getTime();
           let diff = Math.floor((dt - new Date().getTime()) / (86400 * 
         1000));
       console.log('date:', $(elem).text(), 'days diff vs today:', diff);
      });
</code></pre>

<p>html</p>

<pre><code>    &lt;!DOCTYPE html&gt;
      &lt;html lang="en" dir="ltr"&gt;
       &lt;head&gt;
     &lt;meta charset="utf-8"&gt;
         &lt;title&gt;&lt;/title&gt;
     &lt;script src="moment.js"&gt;&lt;/script&gt;

       &lt;script 
      src="https://cdnjs.cloudflare.com/
  ajax/libs/jquery/3.3.1/jquery.slim.min.js" integrity="sha256- 
   3edrmyuQ0w65f8gfBsqowzjJe2iM6n0nKciPUp8y+7E=" crossorigin="anonymous"&gt; 
   &lt;/script&gt;
   &lt;script src="forrealz.js"&gt;&lt;/script&gt;



        &lt;/head&gt;
      &lt;body&gt;

     &lt;p class="para"&gt;
    11/18/2021
      &lt;/p&gt;
    &lt;p class="para"&gt;
  09/12/1999
     &lt;/p&gt;

  &lt;/body&gt;
  &lt;/html&gt;
</code></pre>

<p>Update: Tried this in code pen instead of chrome and it works but the math is wrong.
 "date:" "
      09/18/2018
    " "days diff vs today:" 284
"date:" "
      09/12/1999
    " "days diff vs today:" -6837      </p>


How can I use js (or moment.js) to check if a date is past the current date?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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因此，现在我只想从para类中获取日期，并将其打印到控制台。Jquery和moment都运行得很好。现在，此命令不会将任何内容记录到控制台。我需要查看当前日期是否为任何具有para类的日期之后的x天。在这一点上，我很高兴只将课程日期记录到控制台。js        const dates = $('.para');  ...

问如何使用js (或moment.js)检查日期是否超过当前日期？
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问如何使用js (或moment.js)检查日期是否超过当前日期？
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