<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title></title>
<style>
div {
width: 100px;
height: 100px;
background-color: pink;
position: absolute;
left: 0px;
}
</style>
</head>
<body>
<button id="btn">开始</button>
<div id="box"></div>
</body>
</html>
<script>
var btn = document.getElementById("btn");
var box = document.getElementById("box");
var target = 400;
var timer = null;
btn.onclick = function() {
timer = setInterval(function() {
// 盒子本身的位置 + 步长 (不断变化的)
var step = (target - box.offsetLeft) / 10; // 步长
console.log(step);
step = step > 0 ? Math.ceil(step) : Math.floor(step); // 步长取整
box.style.left = box.offsetLeft + step + "px";
if(box.offsetLeft == target) // 判断结束条件
{
clearInterval(timer);
alert("到目标了")
}
},30)
}
</script>
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