参考百度HTML5入门文档写的.
<html>
<canvas id= "myCanvas"></canvas>
<script>
var canvas = document.getElementById('myCanvas');
var cxt = canvas.getContext('2d');
var grd = cxt.createLinearGradient(0,0,250,250);
grd.addColorStop(0, "FF0000");
grd.addColorStop(1, "00FF00");
cxt.fillStyle= grd;
cxt.fillRect(0,0,250,250);
</script>
</html>
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