利用js 引用的方式鼠标经过弹出效果

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js引用的是此网站代码：
https://www.cnblogs.com/jq-growup/p/15609469.html

<!DOCTYPE html>
<html lang="en"><head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<style>
.sliderbar {
position: fixed;
right: 0;
bottom: 100px;
width: 40px;
height: 40px;
text-align: center;
line-height: 40px;
cursor: pointer;
color: #fff;
} .con {
position: absolute;
left: 0;
top: 0;
width: 200px;
height: 40px;
background-color: purple;
z-index: -1;
}
</style>
<script src="box_mv.js"></script>
</head>
<body>
<div class="sliderbar">
<span>←</span>
<div class="con">问题反馈</div>
</div>
<script>
var sliderbar = document.querySelector('.sliderbar');
var con = document.querySelector('.con');
var span = document.querySelector('span') sliderbar.addEventListener('mouseover',function(){
box_mv(con,-160,function(){
sliderbar.children[0].innerHTML='→';
}); this.addEventListener('mouseout',function(){
box_mv(con,0,function(){
sliderbar.children[0].innerHTML='←';
})
})
})
</script>
</body>
</html>