代码
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<canvas id="test" width="200" height="200">您的浏览器不支持canvas</canvas>
<script>
var a = document.getElementById("test");
var ctx = a.getContext("2d");
var Gradient = ctx.createLinearGradient(0,0,270,0); //圆心坐标是(95,70) 半径是60
Gradient.addColorStop(0,"red");
Gradient.addColorStop(1,"black");
ctx.fillStyle = Gradient;
ctx.fillRect(20,20,150,100);
</script>
运行结果