<!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>
.bar {
width: 40px;
height: 40px;
position: fixed;
top: 10px;
right: 0;
text-align: center;
line-height: 40px;
cursor: pointer;
color: #fff;
}
.con {
position: absolute;
top: 0;
left: 0;
background: darkcyan;
width: 200px;
height: 40px;
z-index: -1;
}
</style>
<script src="animate.js"></script>
</head>
<body>
<div class="bar">
<span>←</span>
<div class="con">意见反馈</div>
</div>
<script>
var bar = document.querySelector('.bar');
var con = document.querySelector('.con');
var span = document.querySelector('span');
bar.addEventListener('mouseenter', function() {
animate(con, -160);
});
bar.addEventListener('mouseleave', function() {
animate(con, 0);
});
function animate(obj, target) {
clearInterval(obj.timer);
obj.timer = setInterval(function() {
var step = (target - obj.offsetLeft) / 10;
step = step > 0 ? Math.ceil(step) : Math.floor(step);
if (con.offsetLeft == target) {
clearInterval(obj.timer);
span.innerHTML = '←';
}
obj.style.left = obj.offsetLeft + step + 'px';
}, 30);
}
</script>
</body>
</html>