链接多个"transitionend“EventListener

Question

我想使用带有“transition end”的EventListenner链接多个图像，比如说我有一个石头-布-剪刀的游戏，每次我点击其中一个按钮玩时，我希望图像从岩石旋转到布，最后旋转到剪刀，每次在交换图像之前等待转换结束，以模拟现实生活中的游戏交互。我已经成功地链接了其中一个转换，但我被困在了如何为多个连续的"transitionend"事件执行此操作的逻辑上

​

let images = ['https://adiihd.github.io/rock-paper-scissors-game/img/rock.png', 'https://adiihd.github.io/rock-paper-scissors-game/img/paper.png', 'https://adiihd.github.io/rock-paper-scissors-game/img/scissors.png'];

const buttons = document.querySelectorAll('button');

// we use the .forEach method to iterate through each button
buttons.forEach((button) => {
  // and for each one we add a 'click' listener
  button.addEventListener('click', (e) => {
    let userImg = document.querySelector("#userimg");
    userImg.classList.add("playing");
    userImg.addEventListener('transitionend', () => {
      userImg.classList.remove("playing");
      userImg.setAttribute('src', images[1]);
    });
    userImg.addEventListener('transitionend', () => {
      userImg.classList.remove("playing");
      userImg.setAttribute('src', images[2]);
    });
  });
});

#userimg {
  transition: all 0.4s ease;
  width: 200px;
}

.playing {
  transform: rotate(30deg);
}

<img id="userimg" src="https://adiihd.github.io/rock-paper-scissors-game/img/rock.png">
<br>
<button id="Rock">Rock</button>
<button id="Paper">Paper</button>
<button id="Scissors">Scissors</button>

​

Answer 1

等待transitionend可能会导致更多问题，而不是它的价值。我不确定您的浏览器兼容性要求，但如果您可以使用动画，我建议您使用它们：

​

let images = ['https://adiihd.github.io/rock-paper-scissors-game/img/rock.png', 'https://adiihd.github.io/rock-paper-scissors-game/img/paper.png', 'https://adiihd.github.io/rock-paper-scissors-game/img/scissors.png'];

const buttons = document.querySelectorAll('button');

// we use the .forEach method to iterate through each button
buttons.forEach((button) => {
  // and for each one we add a 'click' listener
  button.addEventListener('click', async (e) => {
    let userImg = document.querySelector(".userimg");
    userImg.classList.remove("userimg-animation");
    
    // Force a reflow, see https://css-tricks.com/restart-css-animation/
    userImg.offsetWidth;
    
    userImg.classList.add("userimg-animation");
    userImg.setAttribute("choice", button.id.toLowerCase());
  });
});

.imageHolder {
  position: relative;
  display: inline-block;
}

.spacerimg {
  opacity: 0;
}

.userimg-animation {
  width: 100%;
  height: 100%;
  position: absolute;
  animation-name: rockpaperscissors;
  animation-duration: 1.2s;
}

.userimg {
  background-repeat: no-repeat!important;
}

.userimg[choice="rock"] {
  background: url(https://adiihd.github.io/rock-paper-scissors-game/img/rock.png);
}
.userimg[choice="paper"] {
  background: url(https://adiihd.github.io/rock-paper-scissors-game/img/paper.png);
}
.userimg[choice="scissors"] {
  background: url(https://adiihd.github.io/rock-paper-scissors-game/img/scissors.png);
}

@keyframes rockpaperscissors {
  0% {
    background: url(https://adiihd.github.io/rock-paper-scissors-game/img/rock.png);
  }
  33.2% {
    background: url(https://adiihd.github.io/rock-paper-scissors-game/img/rock.png);
  }
  33.3% {
    background: url(https://adiihd.github.io/rock-paper-scissors-game/img/paper.png);
  }
  66.5% {
    background: url(https://adiihd.github.io/rock-paper-scissors-game/img/paper.png);
  }
  66.6% {
    background: url(https://adiihd.github.io/rock-paper-scissors-game/img/scissors.png);
  }
  99.9% {
    background: url(https://adiihd.github.io/rock-paper-scissors-game/img/scissors.png);
  }
  100% {
    background: none;
  }
}

<div class="imageHolder">
  <div class="userimg"></div>
  <img class="spacerimg" src="https://adiihd.github.io/rock-paper-scissors-game/img/rock.png">
</div>
<br>
<button id="Rock">Rock</button>
<button id="Paper">Paper</button>
<button id="Scissors">Scissors</button>

​

注意:我不得不写额外的关键帧，以防止背景之间的动画(它们彼此之间淡入淡出)。然而，你可能想要动画，所以如果你删除每个奇数关键帧，你将有更少的CSS，它们将彼此之间动画。