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                        課程
                    
                        /前端開發(fā)
                        
                            /Html5
                        
                        /炫麗的倒計時效果Canvas繪圖與動畫基礎(chǔ)

<!DOCTYPE?html>
<html>
<script?type="text/javascript">
window.onload?=?function(){
	var?canvas?=?document.getElementById('canvas');
	var?context?=?canvas.getContext('2d');
	if(context){
		context.beginPath();
		context.moveTo(100,100);
		context.lineTo(700,700);
		context.lineTo(100,700);
		context.lineTo(100,100);
		context.closePath();
		context.lineWidth?=?5;
		context.strokeStyle?=?"red";
		context.stroke();

		context.moveTo(200,100);
		context.lineTo(700,600);
		context.strokeStyle?=?"black";
		context.stroke();

	}else{
		alert('當(dāng)前瀏覽器不支持Canvas，請更換瀏覽器后再試');
	}
}
</script>
	<body>
		<canvas?id="canvas"?width="1024"?height="768"?style="border:1px?solid?#aaa;display:block;margin:0?auto;">
			當(dāng)前瀏覽器不支持Canvas，請更換瀏覽器后再試
		</canvas>
	</body>
</html>