<!DOCTYPE?html>
<html>
<script?type="text/javascript">
window.onload?=?function(){
var?canvas?=?document.getElementById('canvas');
var?context?=?canvas.getContext('2d');
if(context){
context.moveTo(100,100);
context.lineTo(700,700);
context.lineTo(100,700);
context.lineTo(100,100);
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(qǐng)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(qǐng)更換瀏覽器后再試
</canvas>
</body>
</html>
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