链接多个“transitionend”事件监听器

Question

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 buttonbuttons.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。