javascript - 根据子 DOM 元素的值应用不同的类

Question

这是这个问题的延伸。

我们得到了一个像下面这样的结构，这取决于score我们添加一个 classwin或.class 的元素的值lose。

<div class="war">
  <div class="team">
    <span class="score">8</span>
  </div>
  <div class="team">
    <span class="score">5</span>
  </div>
</div>
<div class="war">
  <div class="team">
    <span class="score">12</span>
  </div>
  <div class="team">
    <span class="score">25</span>
  </div>
</div>
<div class="war">
  <div class="team">
    <span class="score">57</span>
  </div>
  <div class="team">
    <span class="score">57</span>
  </div>
</div>

用户 Rory McCrossan 提供了一个可行的解决方案https://stackoverflow.com/a/52757164/4236048

document.querySelectorAll('.war').forEach(function(war) {
  var scores = Array.from(war.getElementsByClassName("score"));
  var winIndex = scores.reduce((iMax, x, i, arr) => parseInt(x.innerText, 10) > parseInt(arr[iMax].innerText, 10) ? i : iMax, 0);      
  scores.forEach((score, i) => score.classList.add(winIndex == i ? 'win' : 'lose'));
});

但我没有考虑平局的情况，它的解决方案不再可行。

关于这个新场景中的逻辑如何的任何想法？.win// .lose_.draw

提前致谢

标签： javascriptjquery

Answer 1

更新#2

比较.war项目内的分数并将类应用于.score项目

function applyScoreClass() {
  $('.war').each(function(index, elem) {
    var $elem = $(elem);
    var warScores = [];
    $elem.find('.score').each(function(i,el) {
       var txt = $(el).text();
       var num = (txt && txt.length > 0) ? parseInt(txt) : null;
       if (num !== null) {
           warScores.push({
               elem: $(el),
               score: num
           });
       }
    });
    if (warScores.length === 2) {
       if (warScores[0].score > warScores[1].score) {
           warScores[0].elem.addClass('win');
           warScores[1].elem.addClass('lose');
       } else if (warScores[0].score === warScores[1].score) {
           warScores[0].elem.addClass('draw');
           warScores[1].elem.addClass('draw');
       } else if (warScores[0].score < warScores[1].score) {
           warScores[1].elem.addClass('win');
           warScores[0].elem.addClass('lose');
       }
    }
  });
}

applyScoreClass();

.war {
  border: 1px solid #d8d8d8;
}
.win {
  color: green;
}
.draw {
  color: orange;
}
.lose {
  color: red;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

<div class="war">
  <div class="team">
    <span class="score">8</span>
  </div>
  <div class="team">
    <span class="score">5</span>
  </div>
</div>
<div class="war">
  <div class="team">
    <span class="score">2</span>
  </div>
  <div class="team">
    <span class="score">4</span>
  </div>
</div>