CSS3+JavaScript实现炫酷呼吸效果的示例代码_CSS

用css3动画实现的一个简单炫酷效果,最终的效果图如下:

页面结构():

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>document</title>
  <link rel="stylesheet" href="style.css">
</head>
<body>
  <h1>relax and breath</h1>
  <div class="container">
    <div class="circle"></div>
    <p id="text"></p>
    <div class="pointer-container">
      <div class="pointer"></div>
    </div>
    <div class="gradient-circle"></div>
  </div>
  <script src="script.js"></script>
</body>
</html>

script.js:

const container = document.queryselector('.container');
const text = document.queryselector('#text');

const totaltime = 7500;
const breathtime = (totaltime/5)*2; //呼吸的时间为3s
const holdtime = totaltime/5;    //保持呼吸的时间为1.5s
console.log(breathtime);

breathanimation();    //一开始自执行breathanimation函数
function breathanimation(){
  text.innerhtml = 'breath in';
  container.classname = 'container grow';    //给container添加grow类,实现放大效果

  settimeout(function(){
    text.innerhtml = 'hold on';
    settimeout(function(){
      text.innerhtml = 'breath out';
      container.classname = 'container shrink';//给container添加shrink类,实现缩小效果
    },holdtime)
  },breathtime)
}

setinterval(breathanimation,totaltime);    //重复执行

样式(style.css):

*{
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body{
  background: url('./img/bg.jpg') no-repeat center center /cover;
  min-height: 100vh;
  font-family: arial, helvetica, sans-serif;
  color: #fff;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}
/*注意设置margin为auto*/
.container{
  position: relative;
  width: 300px;
  height: 300px;
  display: flex;
  align-items: center;
  justify-content: center;
  transform: scale(1);
  margin: auto;
}

/*使用圆锥渐变作为背景,宽高比.container稍大,同时z-index要设为-2,因为还有一层为.circle,最外层是文字*/
.gradient-circle{
  position: absolute;
  left: -10px;
  top: -10px;
  background: conic-gradient(
    #55b7a4 0%,
    #4ca493 40%,
    #fff 40%,
    #fff 60%,
    #336d62 60%,
    #2a5b52 100%
  );
  width: 320px;
  height: 320px;
  border-radius: 50%;
  z-index: -2;
}

/z-index为-1,为中间黑色的圆/
.circle{
  position: absolute;
  left: 0;
  top: 0;
  width: 300px;
  height: 300px;
  background-color: #010f1c;
  border-radius: 50%;
  z-index: -1;
}

/*.pointer-container是小球外面的容器,其高设置为190,是因为其中150为半径,还有40为top-40,这样就会绕着圆心转,且不会换到里面来,注意transform-origin为中下方*/
.pointer-container{
  position: absolute;
  width: 20px;
  height: 190px;
  top: -40px;
  left: 140px;
  /* background-color: red; */
  transform-origin: bottom center;
  animation: rotate 7.5s linear forwards infinite;
}

/*小球*/
.pointer{
  width: 20px;
  height: 20px;
  background-color: #fff;
  border-radius: 50%;
}

/*设置小球转圈的效果*/
@keyframes rotate{
  from{
    transform: rotate(0deg);
  }to{
    transform: rotate(360deg);
  }
}
.container.grow{
  animation: grow 3s linear forwards;
}
.container.shrink{
  animation: shrink 2s linear forwards;
}
@keyframes grow{
  from{
    transform: scale(1)
  }to{
    transform: scale(1.2);
  }
}

@keyframes shrink{
  from{
    transform: scale(1.2)
  }to{
    transform: scale(1);
  }
}

如果.container的margin不设置为auto或者一个具体的值,就会造成下图的效果，文字和圆挤在一块:

同时我把.pointer-container里面的 background-color: red; 添上就会更加理解为什么要把.pointer-container的高度设置为190px.另外如果不把transform-origin设置为bottom center它就会如图中标注的默认点旋转,这并不是我们想要的效果.