<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>鼠标进入，延迟显示提示框</title>
<style>
.box{
width: 500px;
height: 500px;
border: 1px solid black;
position: relative;
}
#txt{
display: none;
width: 200px;
height: 30px;
line-height: 30px;
border: 1px solid pink;
position: absolute;
right: 10px;
}
</style>
</head>
<body>
<div class="box">
鼠标进入，延迟显示提示框
<p id="txt">
提示框
</p>
</div>
</body>
<script>
var obox=document.querySelector(".box");
var otxt=document.getElementById("txt")
var t;
obox.onmouseover=function(){
clearTimeout(t)
t = setInterval(function(){
otxt.style.display="block";
},500)
}
obox.onmouseout = function(){
clearTimeout(t)
otxt.style.display="none"
}
</script>
</html>
原文：https://www.cnblogs.com/cupid10/p/12881003.html