<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>鼠标移入移出事件</title>
<style>
* {
margin: 0;
padding: 0;
}
div {
margin: 100px;
width: 300px;
height: 300px;
background-color: rgb(70, 124, 150);
color: white;
font-size: 14px;
position: relative;
}
p {
background-color: rgb(238, 161, 130);
width: 100px;
height: 30px;
line-height: 30px;
text-align: center;
position: absolute;
/* 让光标事件不起作用，解决光标闪烁问题 */
pointer-events: none;
}
</style>
</head>
<body>
<div>
<p>我是提示信息</p>
</div>
<script>
//获取div的dom节点
var divEle = document.querySelector('div')
var pEle = document.querySelector('p')
//获取元素p的尺寸
divEle.onmousemove = function (e) {
//获取事件对象
e = e || window.event
//获取光标位置,并把p元素的光标点设置成中心
var x = e.offsetX - pEle.offsetWidth / 2
var y = e.offsetY - pEle.offsetHeight / 2
//边界判断
//左边界
if (x < 0) {
x = 0
}
//右边界
if (x > divEle.offsetWidth - pEle.offsetWidth) {
x = divEle.offsetWidth - pEle.offsetWidth
}
// 上边界
if (y < 0) {
y = 0
}
// 下边界
if (y > divEle.offsetHeight - pEle.offsetHeight) {
y = divEle.offsetHeight - pEle.offsetHeight
}
pEle.style.top = y + 'px'
pEle.style.left = x + 'px'
}
//鼠标移入出现
divEle.onmouseover = function() {
pEle.style.display = 'block'
}
//鼠标移出隐藏
divEle.onmouseout = function() {
pEle.style.display = 'none'
}
</script>
</body>
</html>