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| <html lang="en">
<head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>css3 Animation</title>
<script type="text/javascript"> function start() {
var text = document.getElementsByClassName("text"); text[0].classList.add("effect"); } </script>
<style type="text/css"> .effect { animation: blink 1s infinite; }
@keyframes blink { 0% { opacity: 0; }
50% { opacity: 0.5; }
100% { opacity: 1; }
} </style> </head>
<body> <div class="text"> hello world</div> <button onclick="start();">开始闪烁</button> </body>
</html>
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