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<title>Document</title>
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<body>
<h1>谁最美？</h1>
<button onclick="start()">开始</button>
<button onclick="end()">结束</button>
<h2 id="title"></h2>
<script>
var arr = ['宝贝','小宝贝','小可爱','臭狗屎','小乖','楠哥','小仙女']
var title = document.getElementById('title')
var timer = null
function start (){
timer = setInterval(function(){
var index = Math.floor(Math.random()*arr.length)
title.innerHTML = arr[index]
},100)
}
function end(){
clearInterval(timer)
}
</script>
</body>
</html>
