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                        課程
                    
                        /前端開(kāi)發(fā)
                        
                            /Html5
                        
                        /炫麗的倒計(jì)時(shí)效果Canvas繪圖與動(dòng)畫(huà)基礎(chǔ)

<!DOCTYPE?html>
<html>
<script?type="text/javascript">
window.onload?=?function(){
	var?canvas?=?document.getElementById('canvas');
	var?context?=?canvas.getContext('2d');
	if(context){
????context.lineWidth?=?5;
????context.strokeStyle?=?"#005588";
????for?(var?i?=?0;?i?<?10;?i++)?{
??????context.beginPath();
??????context.arc(50?+?i*100,60,40,0,2*Math.PI*(i+1)/10);
??????context.closePath();
??????context.stroke();
????}

?????for?(var?i?=?0;?i?<?10;?i++)?{
??????context.beginPath();
??????context.arc(50?+?i*100,180,40,0,2*Math.PI*(i+1)/10);
??????context.stroke();
????}
????for?(var?i?=?0;?i?<?10;?i++)?{
??????context.beginPath();
??????context.arc(50?+?i*100,300,40,0,2*Math.PI*(i+1)/10,true);
??????context.stroke();
????}
????context.fillStyle?=?"red";
?????for?(var?i?=?0;?i?<?10;?i++)?{
??????context.beginPath();
??????context.arc(50?+?i*100,500,40,0,2*Math.PI*(i+1)/10,true);
??????context.fill();
????}


??}else{
		??alert('當(dāng)前瀏覽器不支持Canvas，請(qǐng)更換瀏覽器后再試');
	}
}
</script>
	<body>
		<canvas?id="canvas"?width="1000"?height="800"?style="border:1px?solid?#aaa;display:block;margin:0?auto;">
			當(dāng)前瀏覽器不支持Canvas，請(qǐng)更換瀏覽器后再試
		</canvas>
	</body>
</html>