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ball-animation.html
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<html>
<head>
<meta name="viewport" content="width=device-width,initial-scale=1">
<style>
#stage {
margin-top: 75px;
height: 600px;
position: relative;
}
#ball {
margin-left: 43%;
height: 50px;
position: absolute;
width: 50px;
background-color: red;
border-radius: 30px;
}
hr{
border: blue;
border-bottom: 6px solid blue;
padding-bottom: 598px;
width: 200px;
margin-left:500px;
position: relative;
}
</style>
</head>
<body>
<div id="stage">
<div id="ball"></div>
<hr>
</div>
<br>
<p id="test"></p>
<script>
pos=0;
var elem = document.getElementById("ball");
increment();
function increment(){
var id = setInterval(frame2, 5);
function frame2() {
if (pos == 548) {
decrement();
} else {
pos++;
elem.style.top = pos + 'px';
}
}
}
function decrement(){
var id1 = setInterval(frame,5);
function frame(){
if(pos == 0){
increment();
}else{
pos--;
elem.style.top = pos + 'px';
}
}
}
</script>
</body>
</html>