<body>
<canvas id="cavans" width="200" height="100"></canvas>
</body>
<script>
window.onload = function(){
draw();
}
function draw(){
var canvas = document.getElementById("cavans");
if(!canvas || ! canvas.getContext) return false;
var ss = canvas.getContext('2d');
ss.fillStyle='#FF0000';
ss.fillRect(0,0,150,75);
}
</script>
![无题 ～无题[图]](data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACwAAAAAAQABAAACAkQBADs=)