<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title></title>
<style type="text/css">
body{
background: #ccc
}
.content{
position: absolute
top: 30%
}
#box1{
position: absolute
border: 1px solid red
transition: all 1s/*过渡时间*/
}
#box2{
position: absolute
border: 1px solid red
transition: all 1s/*过渡时间*/
}
.up{
/*图片向上状态*/
-webkit-transform: translateY(-100%)
transform: translateY(-100%)
opacity: 0
}
.down{
/*图片向下状态*/
-webkit-transform: translateY(100%)
transform: translateY(100%)
opacity: 0
}
</style>
</head>
<body>
<button onclick="fadeInOut()">淡入淡出</button>
<div class="content">
<!--图片1-->
<div id="box1" class=""><img src="https://www.baidu.com/img/superlogo_c4d7df0a003d3db9b65e9ef0fe6da1ec.png"/></div>
<!--图片2-->
<div id="box2" class="down"><img src="https://ss0.baidu.com/94o3dSag_xI4khGko9WTAnF6hhy/image/w%3D500/sign=c27d4835de3f8794d3ff482ee21a0ead/024f78f0f736afc3290994e8b919ebc4b7451231.jpg"/></div>
</div>
<script>
function fadeInOut(){
console.log(1)
document.getElementById("box1").className="up"
document.getElementById("box2").className=""
}
</script>
</body>
</html>
function get_mouse(e){var x=(nav)?e.pageX:event.x+document.body.scrollLeftskn.left=event.x
var y=(nav)?e.pageY:event.y+document.body.scrollTopskn.top=event.y-400//skn.top的值等于event.y-400 event.y鼠标Y轴值 400是你的样式里面设置的值！！你要是 想灵活点的话 用js 给img定值 用img.height
}
这段代码覆盖了原来的就可以了
