封装缓动动画函数

最新推荐文章于 2021-06-07 17:55:14 发布

原创最新推荐文章于 2021-06-07 17:55:14 发布 · 398 阅读

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<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title></title>
    <style>
        *{
            margin: 0;
            padding: 0;
        }
        #box{
            width: 100px;
            height: 100px;
            background-color: pink;
            position: absolute;
            left: 0;
            top: 50px;
        }
    </style>
</head>
<body>
<button id="btn200">200</button>
<button id="btn400">400</button>
<div id="box"></div>
</body>
</html>
<script>
    var btn200 = document.getElementById("btn200");
    var btn400 = document.getElementById("btn400");
    var box = document.getElementById("box");
    btn200.onclick = function () {
        animate(box,200);
    }
    btn400.onclick = function () {
        animate(box,400);
    }
    function animate(obj,target){
        //盒子本身位置+步长
        clearInterval(obj.timer);
        obj.timer = setInterval(function(){
            var step = (target-obj.offsetLeft)/10; //步长
            step = step>0?Math.ceil(step):Math.floor(step);//步长取整
            obj.style.left = obj.offsetLeft + step + "px";
            if(target == obj.offsetLeft){
                clearInterval(obj.timer);
            }
        },30);
    }
</script>