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利用css实现一个抽奖动画效果

利用css实现一个抽奖动画效果

首先我们先来看下最终的运行效果：

46cb0b8f0b001abf2b55b3b746c797c.png

从效果图我们可以看到，抽奖会自动进行，并显示中奖信息。

这个效果基本是用CSS实现的，没有用图片，加一丢丢JS。完全没有考虑兼容性。

具体步骤如下：

首先画一个转盘

<!DOCTYPE html>
<html>
<head>
  <meta charset="UTF-8">
  <title>幸运大转盘</title>
  <style>
    /* 重置默认样式 */
    * {
      margin: 0;
      padding: 0;
      border: none;
      outline: none;
    }
    .wrapper {
      position: relative;
      height: 200px;
      width: 200px;
      padding: 20px;
      margin: 20px;
      background-color: #c0381f;
      box-shadow: #000000 0px 0px 10px;
      border-radius: 50%;
    }
    .panel {
      position: relative;
      height: 200px;
      width: 200px;
      background-color: #b7b7b7;
      border-radius: 100px;
    }
    .pointer {
      position: absolute;
      left: 79px;
      top: 79px;
      z-index: 10;
      height: 30px;
      width: 30px;
      padding: 6px;
      color: #fff899;
      line-height: 15px;
      font-size: 12px;
      text-align: center;
      background-color: #dc5b5b;
      border-radius: 50%;
      border: 1px solid #c0381f;
    }
  </style>
</head>
<body>
  <div>
    <div>
      <div>开始抽奖</div>
    </div>
  </div>
</body>
</html>

效果如下，配色什么的不要在意，可能比较丑。。。

4af895263315a6d66f6a5ae9d5f960a.png

然后写抽奖指针的小箭头，用CSS画三角形是一个比较常见的问题，通过设置width和height为0，然后用border实现。

b61c72fdb7fbb1294444f01fae77695.png

如图，矩形是由四个三角形边框组成的，只要设置其它边颜色为透明，就可以获得单独的三角形。

这里通过伪元素after实现三角形，并通过绝对定位将三角形定位到中间小圆的顶端。

.pointer::after {
      content: &#39;&#39;;
      position: absolute;
      left: 14px;
      top: -24px;
      border-width: 12px 6px;
      border-style: solid;
      border-color: transparent;
      border-bottom-color: #c0381f;
}

现在才像一个指针了。

b1d15b547b706c66c2b0a5c9b6bf811.png

接下来是实现转盘背景，不同的扇区对应不同的奖品，这样就有一个需求：实现任意角度扇形。

可能会想当然的认为和三角形一样，不过是加一个border-radius而已，高度是圆半径，宽度是tan(θ/2)，但是实现出来的效果和想象并不一样……（可能需要做一些其他操作以达到效果，但是我没想到。

最后还是求助了搜索引擎。不得不承认dalao们实在是太nb了，qaq……通过 linear-gradient 实现想法是真的棒。不过还有好多复杂的实现看的不是很懂= =

How to draw a circle sector in CSS?

Segments in a circle using CSS3

3种纯CSS实现中间镂空的12色彩虹渐变圆环方法

实现就是通过两个正方形取相交区域。

bf8c6790f42717acda42ef6009594b5.png

我觉图画的还是挺好的:D

没有用伪元素实现，因为我还要加文字，至于文字的位置，我真的是瞎调的，反正正经写代码也不会这么写= =

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <style>
        .sector {
            position: absolute;
            width: 100px;
            height: 200px;
            margin: 100px;
            border-radius: 0px 100px 100px 0;
            overflow: hidden;
            transform: rotate(-18deg);
        }
        .sector-inner {
            text-align: center;
            display: block;
            width: 40px;
            padding: 5px 3px 0 57px;
            height: 195px;
            background: #ffeab1;
            transform: translateX(-100px) rotate(36deg);
            transform-origin: right center;
            border-radius: 100px 0 0 100px;
        }
        .sector-inner span {
            display: block;
            transform-origin: center;
            transform: rotate(-19deg);
            color: #d46854;
        }
    </style>
</head>
<body>
    <div>
        <div>
            <span>谢谢参与</span>
        </div>
    </div>
</body>
</html>

效果如下，一个带有文字的小扇形~~

fac888daeb9fa705233ba1ef8d57804.png

OK，现在写一堆扇形放到一开始的转盘上。

现在的代码是酱紫滴~~太长了折起来。

<!DOCTYPE html>
<html>
<head>
  <meta charset="UTF-8">
  <title>幸运大转盘</title>
  <style>
    /* 重置默认样式 */
    * {
      margin: 0;
      padding: 0;
      border: none;
      outline: none;
    }
    .wrapper {
      position: relative;
      height: 200px;
      width: 200px;
      padding: 20px;
      margin: 20px;
      background-color: #c0381f;
      box-shadow: #000000 0px 0px 10px;
      border-radius: 50%;
    }
    .panel {
      position: relative;
      height: 200px;
      width: 200px;
      background-color: #b7b7b7;
      border-radius: 100px;
    }
    .sector {
      position: absolute;
      width: 100px;
      height: 200px;
      border-radius: 0px 100px 100px 0;
      overflow: hidden;
      left: 100px;
      top: 0px;
      transform-origin: left center;
    }
    .sector:nth-child(1) {
      transform: rotate(-18deg);
    }
    .sector:nth-child(2) {
      transform: rotate(18deg);
    }
    .sector:nth-child(3) {
      transform: rotate(54deg);
    }
    .sector:nth-child(4) {
      transform: rotate(90deg);
    }
    .sector:nth-child(5) {
      transform: rotate(126deg);
    }
    .sector:nth-child(6) {
      transform: rotate(162deg);
    }
    .sector:nth-child(7) {
      transform: rotate(198deg);
    }
    .sector:nth-child(8) {
      transform: rotate(234deg);
    }
    .sector:nth-child(9) {
      transform: rotate(270deg);
    }
    .sector:nth-child(10) {
      transform: rotate(306deg);
    }
    .sector:nth-child(2n+1) .sector-inner {
      background: #fef6e0;
    }
    .sector:nth-child(2n) .sector-inner {
      background: #ffffff;
    }
    .sector-inner {
      text-align: center;
      display: block;
      width: 40px;
      padding: 5px 3px 0 57px;
      height: 195px;
      transform: translateX(-100px) rotate(36deg);
      transform-origin: right center;
      border-radius: 100px 0 0 100px;
    }
    .sector-inner span {
      display: block;
      transform-origin: center;
      transform: rotate(-19deg);
      color: #d46854;
    }
    .pointer {
      position: absolute;
      left: 79px;
      top: 79px;
      z-index: 10;
      height: 30px;
      width: 30px;
      padding: 6px;
      color: #fff899;
      line-height: 15px;
      font-size: 12px;
      text-align: center;
      background-color: #dc5b5b;
      border-radius: 50%;
      border: 1px solid #c0381f;
    }
    .pointer::after {
      content: &#39;&#39;;
      position: absolute;
      left: 14px;
      top: -24px;
      border-width: 12px 6px;
      border-style: solid;
      border-color: transparent;
      border-bottom-color: #c0381f;
    }
  </style>
</head>
<body>
  <div>
    <div>
      <div>
        <div>
          <span>谢谢参与</span>
        </div>
      </div>
      <div>
        <div>
          <span> 50 积分</span>
        </div>
      </div>
      <div>
        <div>
          <span>谢谢参与</span>
        </div>
      </div>
      <div>
        <div>
          <span>100话费</span>
        </div>
      </div>
      <div>
        <div>
          <span> 50 积分</span>
        </div>
      </div>
      <div>
        <div>
          <span>谢谢参与</span>
        </div>
      </div>
      <div>
        <div>
          <span>100话费</span>
        </div>
      </div>
      <div>
        <div>
          <span>谢谢参与</span>
        </div>
      </div>
      <div>
        <div>
          <span> 50 积分</span>
        </div>
      </div>
      <div>
        <div>
          <span>10元话费</span>
        </div>
      </div>
      <div>开始抽奖</div>
    </div>
  </div>
</body>
</html>

c6be1560b404c42f8a10ab73fa94b52.png

嘻嘻，现在是抽奖转盘的样子了吧~~~

（学习视频分享：css视频教程）

最后再加点浮夸的灯。

<!DOCTYPE html>
<html>
<head>
  <meta charset="UTF-8">
  <title>幸运大转盘</title>
  <style>
    /* 重置默认样式 */
    * {
      margin: 0;
      padding: 0;
      border: none;
      outline: none;
    }
    .wrapper {
      position: relative;
      height: 200px;
      width: 200px;
      padding: 20px;
      margin: 20px;
      background-color: #c0381f;
      box-shadow: #000000 0px 0px 10px;
      border-radius: 50%;
    }
    .light {
      position: absolute;
      height: 10px;
      width: 10px;
      border-radius: 50%;
      top: 5px;
      left: 115px;
      transform-origin: 5px 115px;
    }
    .light:nth-child(2n) {
      background-color: #fafce7;
    }
    .light:nth-child(2n+1) {
      background-color: #ffe58b;
    }
    .light:nth-child(2) {
      transform: rotate(36deg);
    }
    .light:nth-child(3) {
      transform: rotate(72deg);
    }
    .light:nth-child(4) {
      transform: rotate(108deg);
    }
    .light:nth-child(5) {
      transform: rotate(144deg);
    }
    .light:nth-child(6) {
      transform: rotate(180deg);
    }
    .light:nth-child(7) {
      transform: rotate(216deg);
    }
    .light:nth-child(8) {
      transform: rotate(252deg);
    }
    .light:nth-child(9) {
      transform: rotate(288deg);
    }
    .light:nth-child(10) {
      transform: rotate(324deg);
    }
    .panel {
      position: relative;
      height: 200px;
      width: 200px;
      background-color: #b7b7b7;
      border-radius: 100px;
    }
    .sector {
      position: absolute;
      width: 100px;
      height: 200px;
      border-radius: 0px 100px 100px 0;
      overflow: hidden;
      left: 100px;
      top: 0px;
      transform-origin: left center;
    }
    .sector:nth-child(1) {
      transform: rotate(-18deg);
    }
    .sector:nth-child(2) {
      transform: rotate(18deg);
    }
    .sector:nth-child(3) {
      transform: rotate(54deg);
    }
    .sector:nth-child(4) {
      transform: rotate(90deg);
    }
    .sector:nth-child(5) {
      transform: rotate(126deg);
    }
    .sector:nth-child(6) {
      transform: rotate(162deg);
    }
    .sector:nth-child(7) {
      transform: rotate(198deg);
    }
    .sector:nth-child(8) {
      transform: rotate(234deg);
    }
    .sector:nth-child(9) {
      transform: rotate(270deg);
    }
    .sector:nth-child(10) {
      transform: rotate(306deg);
    }
    .sector:nth-child(2n+1) .sector-inner {
      background: #fef6e0;
    }
    .sector:nth-child(2n) .sector-inner {
      background: #ffffff;
    }
    .sector-inner {
      text-align: center;
      display: block;
      width: 40px;
      padding: 5px 3px 0 57px;
      height: 195px;
      transform: translateX(-100px) rotate(36deg);
      transform-origin: right center;
      border-radius: 100px 0 0 100px;
    }
    .sector-inner span {
      display: block;
      transform-origin: center;
      transform: rotate(-19deg);
      color: #d46854;
    }
    .pointer {
      position: absolute;
      left: 79px;
      top: 79px;
      z-index: 10;
      height: 30px;
      width: 30px;
      padding: 6px;
      color: #fff899;
      line-height: 15px;
      font-size: 12px;
      text-align: center;
      background-color: #dc5b5b;
      border-radius: 50%;
      border: 1px solid #c0381f;
    }
    .pointer::after {
      content: &#39;&#39;;
      position: absolute;
      left: 14px;
      top: -24px;
      border-width: 12px 6px;
      border-style: solid;
      border-color: transparent;
      border-bottom-color: #c0381f;
    }
  </style>
</head>
<body>
  <div>
    <div></div>
    <div></div>
    <div></div>
    <div></div>
    <div></div>
    <div></div>
    <div></div>
    <div></div>
    <div></div>
    <div></div>
    <div>
      <div>
        <div>
          <span>谢谢参与</span>
        </div>
      </div>
      <div>
        <div>
          <span> 50 积分</span>
        </div>
      </div>
      <div>
        <div>
          <span>谢谢参与</span>
        </div>
      </div>
      <div>
        <div>
          <span>100话费</span>
        </div>
      </div>
      <div>
        <div>
          <span> 50 积分</span>
        </div>
      </div>
      <div>
        <div>
          <span>谢谢参与</span>
        </div>
      </div>
      <div>
        <div>
          <span>100话费</span>
        </div>
      </div>
      <div>
        <div>
          <span>谢谢参与</span>
        </div>
      </div>
      <div>
        <div>
          <span> 50 积分</span>
        </div>
      </div>
      <div>
        <div>
          <span>10元话费</span>
        </div>
      </div>
      <div>开始抽奖</div>
    </div>
  </div>
</body>
</html>

229dc8d9e651832f4c74c03bf2ac40a.png

现在转盘CSS部分基本完成。简单写一下JS部分。点击中间的指针时，指针会转，可以拉一条贝塞尔曲线，控制动画的速度。

贝塞尔曲线可以简单的看作是时间-距离曲线，斜率就是速度。因为转盘的速度肯定是先快后慢，随便拉一条。

http://cubic-bezier.com/#.2,.93,.43,1

682c2232a48c81a322afab7686879fd.png

css中添加属性

.pointer {
  // ...
  transition: transform 3s cubic-bezier(.2,.93,.43,1);
}

点击开始抽奖的时候，为中间的指针加一个旋转的角度。这里有一个问题就是不同的扇区抽到的概率是相同的，改成不同应该…也蛮简单的，不过主要是想练下CSS，JS就随便写了。

JS部分代码。。

let getEle = document.getElementsByClassName.bind(document);
let pointer = getEle(&#39;pointer&#39;)[0];
let result = getEle(&#39;result&#39;)[0];

let onRotation = false; // 记录当前是否正在旋转，如果正在旋转，就不能继续点击了
let reward = [&#39;谢谢参与&#39;, &#39;50积分&#39;, &#39;谢谢参与&#39;, &#39;100元话费&#39;, &#39;50积分&#39;, 
&#39;谢谢参与&#39;, &#39;100元话费&#39;, &#39;谢谢参与&#39;, &#39;50积分&#39;, &#39;10元话费&#39;];

// 根据随机角度获取奖励
let getReward = (function() {
  currentDeg = 0;
  return function() {
    // 转三圈到四圈
    let rotateDeg = Math.random() * 360 + 1080;
    currentDeg += rotateDeg;
    let rewardText = reward[Math.floor((currentDeg + 18) % 360 / 36)]
    return {
      deg: currentDeg,
      text: rewardText === &#39;谢谢参与&#39; ? &#39;很遗憾，您没有获得奖品。&#39; : &#39;恭喜获得: &#39; + rewardText
    }
  }
})();

pointer.addEventListener(&#39;click&#39;, () => {
  if (onRotation) return;
  console.log(&#39;开始抽奖&#39;);
  onRotation = true;
  let nextStatus = getReward();
  console.log(nextStatus)
  result.innerText = nextStatus.text;
  result.style.display = &#39;none&#39;;
  pointer.style.transform = `rotateZ(${nextStatus.deg}deg)`;
})
pointer.addEventListener(&#39;transitionend&#39;, () => {
  console.log(&#39;抽奖结束&#39;);
  onRotation = false;
  result.style.display = &#39;block&#39;;
})

现在一个抽奖转盘基本完成了，最后一个需求，如果旁边的等能够亮起来就好了。

至于灯怎么亮，就需要用到CSS3的动画了，我还不太熟悉，先去学习一下>_<

我学完回来了，参考教程http://www.ruanyifeng.com/blog/2014/02/css_transition_and_animation.html，内容不是很多。

animation-name 指定动画名称，

animation-duration 指定动画持续时间，

animation-timing-function 指定动画函数，和transition的函数是一样的，

animation-delay 指定动画延迟多久后执行，

animation-iteration-count 指定动画执行多少次，默认为一次，可以指定为infinite，无限循环。

animation-direction 指定动画多次播放时，一次结束，下一次怎么接上一次，如图。

c8e08d0b40e548b592ffb83f791967b.png

animation-fill-mode 指定动画结束后停在什么位置，默认回到起始状态，forwards表示让动画停留在结束状态，backwards让动画回到第一帧的状态，both根据animation-direction轮流应用forwards和backwards规则。

animation-play-state 动画执行状态，默认为running，可以设置为pause，动画将在当前状态停止，再改为running时，会接着上一次停止的位置继续执行动画。

使用关键字 keyframes 来定义一个动画。通过百分比指定其中任意几个状态。

尝试着写一下=。=

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <style>
        div {
            height: 30px;
            width: 30px;
            animation: 1s twinkling 3, 100ms 3s twinkling 3;
        }
        @keyframes twinkling {
            50% { background: red; }
        }
    </style>
</head>
<body>
    <div></div>
</body>
</html>

这是一个方块，先慢速闪三下，再快速闪三下，最后消失。

animation: 1s twinkling 3;

就相当于

animation-name: twinkling;
animation-duration: 1s;
animation-timing-function: ease;
animation-delay: 0s;
animation-iteration-count: 3;
animation-direction: normal;
animation-fill-mode: none;
animation-play-state: running;

效果：

33d1459f028ab0a9057c5b785ebc16f.png

我觉得还可以:P 反正我只能写成这样了。

最后把动画加到转盘的灯上。完成代码（好像颜色变了，咳，那是因为我animation学了太久都掉色了）：

<!DOCTYPE html>
<html>
<head>
  <meta charset="UTF-8">
  <title>幸运大转盘</title>
  <style>
    * { /* 重置默认样式 */
      margin: 0;
      padding: 0;
      border: none;
      outline: none;
      user-select: none;
    }
    .wrapper {
      position: relative;
      height: 200px;
      width: 200px;
      padding: 20px;
      margin: 20px;
      background-color: #ff5555;
      box-shadow: #000000 0px 0px 10px;
      border-radius: 50%;
    }
    .light {
      position: absolute;
      height: 10px;
      width: 10px;
      border-radius: 50%;
      top: 5px;
      left: 115px;
      transform-origin: 5px 115px;
    }
    .light-twinkling {
      animation: 1s twinkling 3, 100ms 3s twinkling 3;
    }
    .light:nth-child(2n) {
      background-color: #fafce7;
    }
    .light:nth-child(2n+1) {
      background-color: #ffe58b;
    }
    .light:nth-child(2) {
      transform: rotate(36deg);
    }
    .light:nth-child(3) {
      transform: rotate(72deg);
    }
    .light:nth-child(4) {
      transform: rotate(108deg);
    }
    .light:nth-child(5) {
      transform: rotate(144deg);
    }
    .light:nth-child(6) {
      transform: rotate(180deg);
    }
    .light:nth-child(7) {
      transform: rotate(216deg);
    }
    .light:nth-child(8) {
      transform: rotate(252deg);
    }
    .light:nth-child(9) {
      transform: rotate(288deg);
    }
    .light:nth-child(10) {
      transform: rotate(324deg);
    }
    .panel {
      position: relative;
      height: 200px;
      width: 200px;
      background-color: #b7b7b7;
      border-radius: 100px;
    }
    .sector {
      position: absolute;
      left: 100px;
      top: 0px;
      width: 100px;
      height: 200px;
      font-size: 14px;
      border-radius: 0px 100px 100px 0;
      overflow: hidden;
      transform-origin: left center;
    }
    .sector:nth-child(1) {
      transform: rotate(-18deg);
    }
    .sector:nth-child(2) {
      transform: rotate(18deg);
    }
    .sector:nth-child(3) {
      transform: rotate(54deg);
    }
    .sector:nth-child(4) {
      transform: rotate(90deg);
    }
    .sector:nth-child(5) {
      transform: rotate(126deg);
    }
    .sector:nth-child(6) {
      transform: rotate(162deg);
    }
    .sector:nth-child(7) {
      transform: rotate(198deg);
    }
    .sector:nth-child(8) {
      transform: rotate(234deg);
    }
    .sector:nth-child(9) {
      transform: rotate(270deg);
    }
    .sector:nth-child(10) {
      transform: rotate(306deg);
    }
    .sector:nth-child(2n+1) .sector-inner {
      background: #fef6e0;
    }
    .sector:nth-child(2n) .sector-inner {
      background: #ffffff;
    }
    .sector-inner {
      text-align: center;
      display: block;
      width: 40px;
      padding: 5px 3px 0 57px;
      height: 195px;
      transform: translateX(-100px) rotate(36deg);
      transform-origin: right center;
      border-radius: 100px 0 0 100px;
    }
    .sector-inner span {
      display: block;
      transform-origin: center;
      transform: rotate(-19deg);
      color: #d46854;
    }
    .pointer {
      position: absolute;
      left: 79px;
      top: 79px;
      z-index: 10;
      height: 30px;
      width: 30px;
      padding: 6px;
      color: #fff899;
      line-height: 15px;
      font-size: 12px;
      text-align: center;
      background-color: #ff5350;
      border-radius: 50%;
      border: 1px solid #ff5350;
      transition: transform 3s cubic-bezier(.2,.93,.43,1);
    }
    .pointer::after {
      content: &#39;&#39;;
      position: absolute;
      left: 14px;
      top: -24px;
      border-width: 12px 6px;
      border-style: solid;
      border-color: transparent;
      border-bottom-color: #ff5350;
      transform-origin: center;
    }
    .result {
      margin: 20px 60px;
    }

    @keyframes twinkling {
      50% { background: transparent; }
    }
  </style>
</head>
<body>
  <div>
    <div></div>
    <div></div>
    <div></div>
    <div></div>
    <div></div>
    <div></div>
    <div></div>
    <div></div>
    <div></div>
    <div></div>
    <div>
      <div>
        <div>
          <span>谢谢参与</span>
        </div>
      </div>
      <div>
        <div>
          <span> 5 0 积分</span>
        </div>
      </div>
      <div>
        <div>
          <span>谢谢参与</span>
        </div>
      </div>
      <div>
        <div>
          <span>100元话费</span>
        </div>
      </div>
      <div>
        <div>
          <span> 5 0 积分</span>
        </div>
      </div>
      <div>
        <div>
          <span>谢谢参与</span>
        </div>
      </div>
      <div>
        <div>
          <span>100元话费</span>
        </div>
      </div>
      <div>
        <div>
          <span>谢谢参与</span>
        </div>
      </div>
      <div>
        <div>
          <span> 5 0 积分</span>
        </div>
      </div>
      <div>
        <div>
          <span>10元话费</span>
        </div>
      </div>
      <div>开始抽奖</div>
    </div>
  </div>
  <div></div>

  <script>
    let getEle = document.getElementsByClassName.bind(document);
    let pointer = getEle(&#39;pointer&#39;)[0];
    let result = getEle(&#39;result&#39;)[0];
    let lights = Array.prototype.slice.call(getEle(&#39;light&#39;));

    let onRotation = false; // 记录当前是否正在旋转，如果正在旋转，就不能继续点击了
    let reward = [&#39;谢谢参与&#39;, &#39;50积分&#39;, &#39;谢谢参与&#39;, &#39;100元话费&#39;, &#39;50积分&#39;, 
    &#39;谢谢参与&#39;, &#39;100元话费&#39;, &#39;谢谢参与&#39;, &#39;50积分&#39;, &#39;10元话费&#39;];

    // 根据随机角度获取奖励
    let getReward = (function() {
      currentDeg = 0;
      return function() {
        // 转三圈到四圈
        let rotateDeg = Math.random() * 360 + 1080;
        currentDeg += rotateDeg;
        let rewardText = reward[Math.floor((currentDeg + 18) % 360 / 36)]
        return {
          deg: currentDeg,
          text: rewardText === &#39;谢谢参与&#39; ? &#39;很遗憾，您没有获得奖品。&#39; : &#39;恭喜获得: &#39; + rewardText
        }
      }
    })();

    pointer.addEventListener(&#39;click&#39;, () => {
      if (onRotation) return;
      console.log(&#39;开始抽奖&#39;);
      onRotation = true;
      lights.forEach(light => { light.className += &#39; light-twinkling&#39;; });
      let nextStatus = getReward();
      console.log(nextStatus)
      result.innerText = nextStatus.text;
      result.style.display = &#39;none&#39;;
      pointer.style.transform = `rotateZ(${nextStatus.deg}deg)`;
    })
    pointer.addEventListener(&#39;transitionend&#39;, () => {
      console.log(&#39;抽奖结束&#39;);
      setTimeout(() => { // 等闪烁三下结束
        onRotation = false;
        lights.forEach(light => { light.className = &#39;light&#39;; });
        result.style.display = &#39;block&#39;;
      }, 300);
    })
  </script>
</body>
</html>

原文链接：https://www.cnblogs.com/wenruo/p/9732704.html

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