javascript - 一次 3D 翻转多张卡片

Question

我正在尝试理解文章中的 3D 卡片动画翻转功能:http://callmenick.com/post/css-transitions-transforms-animations-flipping-card

但我不知道如何在单击时一次翻转 2 张卡片。例如，如果我点击第一张牌，我也想同时翻转第二张牌。

HTML:

<div class="card effect__click">
  <div class="card__front">
    <span class="card__text">front</span>
  </div>
  <div class="card__back">
    <span class="card__text">back</span>
  </div>
</div>

CSS:

.card {
  position: relative;
  float: left;
  padding-bottom: 25%;
  width: 25%;
  text-align: center;
}

.card__front,
.card__back {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

.card__front,
.card__back {
  -webkit-backface-visibility: hidden;
          backface-visibility: hidden;
  -webkit-transition: -webkit-transform 0.9s;
          transition: transform 0.9s;
}
.card__text{color:#fff;}
.card__front {
  background-color: #ff5078;
}

.card__back {
  background-color: #1e1e1e;
  -webkit-transform: rotateY(-180deg);
          transform: rotateY(-180deg);
}
.card.effect__hover:hover .card__front {
  -webkit-transform: rotateY(-180deg);
          transform: rotateY(-180deg);
}

.card.effect__hover:hover .card__back {
  -webkit-transform: rotateY(0);
          transform: rotateY(0);
}
.card.effect__click.flipped .card__front {
  -webkit-transform: rotateY(-180deg);
          transform: rotateY(-180deg);
}

.card.effect__click.flipped .card__back {
  -webkit-transform: rotateY(0);
          transform: rotateY(0);
}

JS:

(function() {
  var cards = document.querySelectorAll(".card.effect__click");
  for ( var i  = 0, len = cards.length; i < len; i++ ) {
    var card = cards[i];
    clickListener(card);
  }

  function clickListener(card) {
    card.addEventListener( "click", function() {
      var c = this.classList;
      c.contains("flipped") === true ? c.remove("flipped") : c.add("flipped");
    });
  }
})();

Answer 1

或者querySelector[All]对于使用 :nth-child 的下一个元素选择器或其他合适的选择器或使用 nextElementSibling :

(function() {
  var cards = document.querySelectorAll(".card.effect__click");
  for ( var i  = 0, len = cards.length; i < len; i++ ) {
    var card = cards[i];
    clickListener(card);
  }
  
  function flip(card){
    if (!card) return;
    var c = card.classList;
      c.contains("flipped") === true ? c.remove("flipped") : c.add("flipped");
    }

  function clickListener(card) {
    card.addEventListener( "click", function() {
      flip(this);
      flip(this.nextElementSibling);
    });
  }
})();

.card {
  position: relative;
  float: left;
  padding-bottom: 25%;
  width: 25%;
  text-align: center;
}

.card__front,
.card__back {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

.card__front,
.card__back {
  -webkit-backface-visibility: hidden;
          backface-visibility: hidden;
  -webkit-transition: -webkit-transform 0.9s;
          transition: transform 0.9s;
}
.card__text{color:#fff;}
.card__front {
  background-color: #ff5078;
}

.card__back {
  background-color: #1e1e1e;
  -webkit-transform: rotateY(-180deg);
          transform: rotateY(-180deg);
}
.card.effect__hover:hover .card__front {
  -webkit-transform: rotateY(-180deg);
          transform: rotateY(-180deg);
}

.card.effect__hover:hover .card__back {
  -webkit-transform: rotateY(0);
          transform: rotateY(0);
}
.card.effect__click.flipped .card__front {
  -webkit-transform: rotateY(-180deg);
          transform: rotateY(-180deg);
}

.card.effect__click.flipped .card__back {
  -webkit-transform: rotateY(0);
          transform: rotateY(0);
}

<div class="card effect__click">
  <div class="card__front">
    <span class="card__text">front</span>
  </div>
  <div class="card__back">
    <span class="card__text">back</span>
  </div>
</div>
<div class="card effect__click">
  <div class="card__front">
    <span class="card__text">front</span>
  </div>
  <div class="card__back">
    <span class="card__text">back</span>
  </div>
</div>