js动画之在指定时间内实现单方向匀速运动-js教程-PHP中文网

js动画之在指定时间内实现单方向匀速运动

巴扎黑

发布： 2017-07-20 14:16:18

原创

1218人浏览过

具体代码如下

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <style>
        *{
            margin:0;
            padding:0;
        }
        #box{
            position:absolute;
            top:0;
            left:0;
            padding:0;
            width:100px;
            height:100px;
            background:lightblue;

        }</style>
</head>
<body>
    <div id='box'></div>
    <script>//思想1：var oBox = document.getElementById('box');//实现一个匀速运动:在指定时间内完成动画：计算出总距离/总时间，然后求出对应的步长（每10ms走一步的话需要走多远）var maxLeft = (document.documentElement.clientWidth || document.body.clientWidth) - oBox.offsetWidth;var duration = 2000;var step = (maxLeft/duration)*10;var timer = window.setInterval(function(){var curLeft = utils.css(oBox,"left");
            curLeft+=step;if(curLeft>=maxLeft){
                window.clearInterval(timer);return;
            }
            utils.css(oBox,"left",curLeft);
        },10)//思想2：function Linear(t,b,c,d){//相对应的是time begin change durationreturn c*t/d+b        }var oBox = document.getElementById('box');var target = (document.documentElement.clientWidth || document.body.clientWidth) - oBox.offsetWidth;var begin = utils.css(oBox,'left'),change = target-begin;var duration = 2000,time = null;var timer = window.setInterval(function(){
            time+=10;if(time>=duration){
                utils.css(oBox,"left",target);
                window.clearInterval(timer);return;
            }var curPos = Linear(time,begin,change,duration);
            utils.css(oBox,"left",curPos)

        },10)</script>
</body>
</html>

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