html无卡顿动画实现——requestAnimationFrame

时间：2023-03-08 23:50:46
html无卡顿动画实现——requestAnimationFrame 
<!DOCTYPE html>

<html lang="en" xmlns="http://www.w3.org/1999/xhtml">

<head>

    <meta charset="utf-8" />

    <title></title>

</head>

<body>

    <div style="width:50px; height:50px; background-color:red;margin-left:2px;">

        文字

    </div>

</body>

</html>

<script>

    var px = 5;

    var myReq;

    function test() {

        var div = document.querySelector('div');

        div.style.marginLeft = (parseInt(div.style.marginLeft.replace('px', '')) + px) + 'px';

        //if (parseInt(div.style.marginLeft.replace('px', '')) > 500) {

        //    px = -px;

        //}

        //if (parseInt(div.style.marginLeft.replace('px', '')) <= 0) {

        //    px = -px;

        //}

        if (parseInt(div.style.marginLeft.replace('px', '')) > 500) {

            //window.cancelAnimationFrame(myReq);

            return;

        }

        myReq = window.requestAnimationFrame(test);

    }

    myReq = window.requestAnimationFrame(test);

</script>

　　

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