<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>方块运动</title>
</head>
<style>
*{
padding: 0;
margin: 0;
list-style: none;
}
div{
position: absolute;
left: 600px;
top:0;
width: 100px;
height: 100px;
background: orange;
}
span{
position: absolute;
left: 300px;
top:0;
width:1px;
height: 100px;
background: #000;
}
</style>
<body>
<div></div>
<span></span>
</body>
<script>
var div = document.getElementsByTagName('div')[0];
var timer = null;
div.onclick = function () {
startMove(this);
}
function startMove (obj) {
clearInterval(timer);
var iSpeed;
if (obj.offsetLeft > 300) {
iSpeed = -5;
} else {
iSpeed = 5
}
timer = setInterval(function (){
if (Math.abs(300 - obj.offsetLeft) < Math.abs(iSpeed)) {
clearInterval(timer);
obj.style.left = '300px'
} else {
obj.style.left = obj.offsetLeft + iSpeed + 'px';
}
},30)
}
</script>
</html>
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