Canvas - Use timers to simulate dynamic loading animations!

高洛峰

Release： 2016-10-12 11:05:07

Original

1810 people have browsed it

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title></title>
    <style>

    </style>
</head>
<body>
   <canvas id="canvas" width="500" height="500">你的浏览器不支持canvas技术</canvas>
   <script>
       var c=document.getElementById(&#39;canvas&#39;);
       var ctx= c.getContext(&#39;2d&#39;);
       ctx.translate(c.width/2, c.height/2);
       //首先绘制8个静态环绕的圆形
       function create() {
           for (var i = 1; i < 9; i++) {
               if (i==1) {
                   ctx.beginPath();
                   ctx.arc(0, -30, 5, 0, 2 * Math.PI);
                   ctx.fillStyle=&#39;#f0f&#39;;
                   ctx.fill();
               }else{
                   ctx.beginPath();
                   ctx.arc(0, -30, 5, 0, 2 * Math.PI);
                   ctx.strokeStyle =&#39;#000&#39;;
                   ctx.stroke();
               }
               ctx.rotate(Math.PI * 45 / 180);
           }
       }
       //定时转动
       setInterval(function(){
           ctx.clearRect(-c.width/2,-c.height, c.width, c.height);
           create();
           ctx.rotate(Math.PI*45/180);
       },300);
       //定时关闭加载
       setTimeout(function(){
          c.style.display=&#39;none&#39;;
      },12200);
       //
   </script>
</body>
</html>

Copy after login

Related labels：

Canvas——使用定时器模拟动态加载动画！

source：php.cn

Previous article：html5 video.js uses and is compatible with all browsers Next article：Based on HTML5, the problem of adding video in the parent block and not being able to play in full screen is solved.

Statement of this Website

The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn