css3 Animation
hello world
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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.getElementById("text");
//text返回Object HTMLDivElement
// text.classList.add("effect");
// }
function start() {

var text = document.getElementsByClassName("text");
//text返回Object HTMLCollection
text[0].classList.add("effect");
}
</script>

<style type="text/css">
.effect {
animation: blink 1s infinite;
/*infinite 无限的*/
}

@keyframes blink {
0% {
opacity: 0;
}

50% {
opacity: 0.5;
}

100% {
opacity: 1;
}

}
</style>
</head>

<body>
<!-- <div id="text"> hello world</div> -->
<div class="text"> hello world</div>
<button onclick="start();">开始闪烁</button>
</body>

</html>

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