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javascript - 链接多个“transitionend”事件监听器

问题描述

我想使用带有“transitionend”的 EventListenner 链接多个图像，例如我有一个石头剪刀布游戏，每次单击其中一个按钮播放时，我希望图像从石头旋转，到纸，最后到剪刀，每次都等待过渡结束，然后再次交换图像，模拟现实生活中的游戏交互。我已经设法链接其中一个转换，但我坚持如何为多个连续"transitionend"事件执行此操作的逻辑

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>

标签： javascripthtmlcssdom-eventsaddeventlistener

解决方案

等待 transitionend 可能会导致更多的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：我必须编写额外的关键帧以防止背景之间的动画（它们在彼此之间淡出）。但是您可能需要动画，因此如果您删除每个奇数关键帧，您将拥有更少的 CSS 并且它们将在彼此之间进行动画处理。

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