Jquery implements dynamic drawing of circles

2020-03-30 04:30:03
OfStack

Today, I found a good knowledge in the process of writing plug-ins. I made a little example myself.



<!doctype html>

<html>

<head>

<meta charset="utf-8">

<title> Headless document </title>

<!-- The script to load -->

<script src="http://libs.baidu.com/jquery/1.9.1/jquery.min.js" type="text/javascript"></script>

<script type="text/javascript">

$(document).ready(function(e) {

    var a = 200, b = 200, r = 90, times = 0;

    setInterval(function flutter() {

        times += 0.1;

        var hudu = (2*Math.PI / 360) * 6 * times;

        var X = a + Math.sin(hudu) * r;

        var Y = b - Math.cos(hudu) * r    //  Notice the minus sign here, because we're going to get Y relative to 0,0. < br / >
        //$(".sky_text").css({"left":X+"px","top":Y+"px"});

        $("body").append('<div style="position:absolute; left:'+X+'px; top:'+Y+'px; width:1px; height:1px; background:#00F;"></div>');

        if(times == 60){

            return;

        }

    }, 2);

});

</script>

<style type="text/css">

body,html{ padding:0; margin:0;}

</style>

</head>

<body>

<div style="position:absolute; left:198px; top:198px; width:4px; height:4px; background:#F00;"></div>

</body>

</html>