<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<div id="div1" style="position: absolute; background: red; width: 500px; height: 500px;"></div>
<div id="div2" style="position: absolute; background: blueviolet; width: 50px; height: 50px; border-radius: 50%;"> </div>
<script>
var di1=document.getElementById("div1");
var count=0;
var hei=0;
var vgfb =50;
var bool=true;
var setInterVal =setInterval(function(){
var di2=document.getElementById("div2");
if(hei<=0||count<=0){
bool=true;
}
if(hei>=450||count>=450 ){
bool=false;
}
if(bool){
count=count+vgfb;
hei=hei+vgfb;
div2.style.left=count+"px";
div2.style.top=hei+"px";
}
else{
count=count-vgfb;
hei=hei-vgfb;
div2.style.left=count+"px";
div2.style.top=hei+"px";
}
},1000)
</script>
</body>
</html>
用做運動的小球遊戲
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