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百分百加载动画

2024-09-01 19:46:21   219人阅读

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<canvas id="canvas" width="500" height="500">
    您的浏览器不支持canvas
</canvas>
<script>
window.onload = function () {
    var canvas = document.getElementById(‘canvas‘),
            context = canvas.getContext(‘2d‘),
            cirX = canvas.width/ 2,
            cirY = canvas.height/ 2,
            rad = Math.PI * 2 /100,
            n = 1,
            speed = 150,
            r = 100;
    //绘制最外层细圈
    function writeCircle(){
        context.save();
        context.beginPath();
        context.strokeStyle = ‘skyblue‘;
        context.arc(cirX,cirY,r,0,Math.PI * 2,false);
        context.stroke();
        context.restore();
    }
    //绘制文本
    function writeText(n){
        context.save();
        context.strokeStyle = ‘skyblue‘;
        context.font = ‘40px Arial‘;
        context.strokeText(n.toFixed(0)+‘%‘,cirX-30,cirY+10);
        context.stroke();
        context.restore();
    }
    //绘制蓝色外圈
    function writeBlue(n){
        context.save();
        context.strokeStyle = ‘skyblue‘;
        context.lineWidth = 4;
        context.beginPath();
        context.arc(cirX,cirY,r,-Math.PI/2,-Math.PI/2+rad*n,false);
        context.stroke();
        context.restore();
    }

    function DreamLoading(){
        //清除所有，重新绘制
        context.clearRect(0,0,canvas.width,canvas.height);
        writeCircle();
        writeText(n);
        writeBlue(n);
        if(n < 100){
            n = n + 0.1;
        }else{
            n = 0;
        }
        requestAnimationFrame(DreamLoading);
    }
    DreamLoading();
}

</script>
</body>
</html>

百分百加载动画


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