JavaScript 眨眼动画

Question

我目前正在尝试学习 JavaScript 并尝试很多东西，但就目前而言，我的 JS 技能仍然非常有限。我创建了一个小游戏，其中有一个随机出现的带有兔子头的盒子，用户必须尽快点击它们。

所以我用间隔动画创建了兔子，兔子每 2 秒闭上眼睛并睁开眼睛。现在我觉得有点愚蠢，但我无法让动画按我想要的方式工作。现在，兔子每 2 秒闭上眼睛，然后每 2 秒再次睁开眼睛。但是，我希望它只眨眼，这意味着眼睛应该闭上片刻然后再睁开，这样兔子每 2 秒眨一次眼。然后我也希望它随机地有时只眨一次眼，有时眨眼两次。不确定这是否简单，而且我只是对数小时的编码和学习新事物视而不见，但看来我可能需要你的帮助。

Here is a fiddle整个事情的现状。

您可以看到在 fiddle 中使用的完整代码。我不想在代码部分发布整个网站，但我认为我的动画感兴趣的部分。

这里是眨眼的js代码:

var eyeleft = document.getElementById("eyeleft");
var eyeright = document.getElementById("eyeright");

window.onload = setInterval(function() {
    eyeleft.className = (eyeleft.className != 'closedeyeleft' ? 'closedeyeleft' : 'eyeleft');
    eyeright.className = (eyeright.className != 'closedeyeright' ? 'closedeyeright' : 'eyeright');
    }, 2000);

接下来是 HTML

<div id="shape" class="game-shapes">
    <div class="ears left"></div>
    <div class="ears right"></div>
    <div id="eyeleft" class="eyeleft"></div>
    <div id="eyeright" class="eyeright"></div>
    <div id="mouth">
        <div id="tooth"></div>
        <div id="tongue"></div>
    </div>
</div>

现在是 CSS

.game-shapes {
  height: 80px;
  width: 80px;
  cursor: pointer;
  opacity: 0;
  position: relative;
  transition: opacity ease-in-out .2s;
}
.game-shapes div {
  position: absolute;
}
.eyeleft,
.eyeright {
  background: #000;
  border-radius: 50%;
  width: 20px;
  height: 20px;
  top: 30px;
}
.eyeleft {
  left: 4px;
}
.eyeright {
  right: 4px;
}
.eyeleft:before,
.eyeleft:after,
.eyeright:before,
.eyeright:after {
  content: '';
  background: #fff;
  width: 7px;
  height: 7px;
  top: 4px;
  left: 4px;
  border-radius: 50%;
  position: absolute;
  z-index: 5;
}
.eyeleft:after,
.eyeright:after {
  width: 4px;
  height: 4px;
  top: 10px;
  left: 10px;
}
.closedeyeleft,
.closedeyeright {
  background: transparent none repeat scroll 0 0;
  border-color: #000;
  border-radius: 5px;
  border-style: solid;
  border-width: 4px 4px 0;
  height: 4px;
  top: 35px;
  width: 12px;
}
.closedeyeleft {
  left: 3px;
}
.closedeyeright {
  right: 3px;
}

Answer 1

感谢您提出一个格式正确且包含大量详细信息的问题!

这是一个提供快速眨眼和随机第二次眨眼的潜在解决方案。

//made blink a named function to improve readability a bit
var blink = function(isSecondBlink) {
  //got rid of the ternary expressions since we're always doing
  //open eyes -> close eyes -> delay -> open eyes

  //close both eyes
  eyeleft.className = "closedeyeleft";
  eyeright.className = "closedeyeright";

  //let's reopen those eyes after a brief delay to make a nice blink animation
  //as it happens, humans take ~250ms to blink, so let's use a number close to there
  setTimeout(function() {
      eyeleft.className = "eyeleft";
      eyeright.className = "eyeright";
  }, 200);

  if (isSecondBlink) { return; } //prevents us from blinking 3+ times

  //This provides a 40% chance of blinking twice, adjust as needed
  var blinkAgain = Math.random() <= 0.4;

  //if we need to blink again, go ahead and do it in 300ms
  if (blinkAgain) {
    setTimeout(function() { blink(true); }, 300);
  }
}

//go ahead and blink every 2 seconds
window.onload = setInterval(blink, 2000);