代码：
<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
<title>无标题文档</title>
<style>
#div1 {
width: 100px;
height: 100px;
background: #ff4b46;
position: absolute;
left: 100px;
top: 50px;
}
#vertical_line {
width: 1px;
height: 300px;
position: absolute;
left: 300px;
top: 0;
background: black;
}
</style>
<script>
var timer = null;
function startMove(iTarget) {
clearInterval(timer);
timer = setInterval(function () {
var oDiv = document.getElementById("div1");
var speed = 0;
if (oDiv.offsetLeft < iTarget) {
speed = 7;
}
else {
speed = -7;
}
if (Math.abs(iTarget - oDiv.offsetLeft) <= 7) {
clearInterval(timer);
oDiv.style.left = iTarget + 'px';
} else {
speed = 7;
oDiv.style.left = oDiv.offsetLeft + speed + "px";
document.title = oDiv.offsetLeft + ',' + speed;
}
}, 30);
}
</script>
</head>
<body>
<input type="button" value="开始运动" onclick="startMove(300)">
<div id="div1">
</div>
<div id="vertical_line"></div>
</body>
</html>
运行结果：
初始界面：
点击鼠标之后界面：
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