<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<h1 class="time"></h1>
<button class="stop">暂停时间</button>
<script type="text/javascript">
//间隔函数：
var ti =setInterval(function(){
var time = new Date()
var h1=document.querySelector("h1")
h1.innerHTML=time
},1000)
var st=document.querySelector(".stop")
st.onclick=function(){
clearInterval(ti)
}
//延迟函数：多少毫秒后在执行这个函数
var timeoust=setTimeout(function(){
var h1=document.querySelector("h1")
h1.style.background="hotpink"
},5000)
//清除延迟函数
// clearTimeout(timeoust)
</script>
</body>
</html>
