JavaScript实现星空闪烁与鼠标交互特效

 <style>
 *{
  margin: 0;
  padding: 0;
  list-style: none;
 }

 body{
  background-color: #000;
 }

 span{
  width: 30px;
  height: 30px;
  background: url("../images_js/star.png") no-repeat;
  position: absolute;
  background-size:100% 100%;
  animation: flash 1s alternate infinite;
 }

 @keyframes flash {
  0%{opacity: 0;}
  100%{opacity: 1;}
 }

 span:hover{
  transform: scale(3, 3) rotate(180deg) !important;
  transition: all 1s;
 }
 </style>
</head>
<body>
<script>
 window.onload = function () {
 // 1. 求出屏幕的尺寸
 var screenW = document.documentElement.clientWidth;
 var screenH = document.documentElement.clientHeight;

 // 2. 动态创建星星
 for(var i=0; i<150; i++){
  // 2.1 创建星星
  var span = document.createElement('span');
  document.body.appendChild(span);

  // 2.2 随机的坐标
  var x = parseInt(Math.random() * screenW);
  var y = parseInt(Math.random() * screenH);
  span.style.left = x + 'px';
  span.style.top = y + 'px';

  // 2.3 随机缩放
  var scale = Math.random() * 1.5;
  span.style.transform = 'scale('+ scale + ', ' + scale + ')';

  // 2.4 频率
  var rate = Math.random() * 1.5;
  span.style.animationDelay = rate + 's';
 }
 }
</script>