本文介绍了JavaScript检测鼠标移动方向的方法，涉及javascript鼠标操作的相关技巧，供大家参考，具体内容如下
判断鼠标移入方向的功能函数
function getDir(ev, ele) {
var l = ele.getBoundingClientRect().left;
var t = ele.getBoundingClientRect().top;
var w = ele.getBoundingClientRect().width;
var h = ele.getBoundingClientRect().height;
var x = (ev.clientX - l - w / 2) * (w > h "htmlcode">
<div id="container">
<img src="/UploadFiles/2021-04-02/bg.jpg">
CSS:
*{
margin: 0;
padding: 0;
}
#container{
width: 400px;
height: 200px;
position: relative;
margin-top: 100px;
margin-left: 200px;
overflow: hidden;
}
#container img{
width: 100%;
height: 100%;
transition: 0.5s;
}
#container p{
width: 100%;
height: 100%;
padding: 10px;
box-sizing: border-box;
position: absolute;
left: 0;
/* top: 0; */
background: rgba(0, 0, 0, .7);
color: #ccc;
font-size: 14px;
line-height: 24px;
}
#container:hover img{
transform: scale(1.1);
}
JS:
window.onload = function () {
var box = document.getElementById('container');
var ps = document.getElementsByClassName('ps');
var pos=[
{left:0,top:'-100%'},
{left:'100%',top:0},
{left:0,top:'100%'},
{left:'-100%',top:0}
]
box.onmouseenter = function(ev){
var dir = getDir(ev,this);
ps[0].style.transition='';
ps[0].style.left=pos[dir].left;
ps[0].style.top=pos[dir].top;
setTimeout(function(){
ps[0].style.transition='.3s';
ps[0].style.left=0;
ps[0].style.top=0;
},1000/60)
}
box.onmouseleave = function(ev){
var dir = getDir(ev,this);
setTimeout(function(){
ps[0].style.transition='';
ps[0].style.left=pos[dir].left;
ps[0].style.top=pos[dir].top;
},100)
}
}
function getDir(ev, ele) {
var l = ele.getBoundingClientRect().left;
var t = ele.getBoundingClientRect().top;
var w = ele.getBoundingClientRect().width;
var h = ele.getBoundingClientRect().height;
var x = (ev.clientX - l - w / 2) * (w > h ? (h / w) : 1);
var y = (ev.clientY - t - h / 2) * (h > w ? (w / h) : 1);
var deg = Math.atan2(y, x) / (Math.PI / 180);
var d = (Math.round((deg + 180) / 90) + 3) % 4;
return d;
// d的值{上:0,右:1,下:2,左:3}
}
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。