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var lingrad = ctx.createLinearGradient(0, 0, 0, 200);
lingrad.addColorStop(0, '#ff0000');
lingrad.addColorStop(1 / 7, '#ff9900');
lingrad.addColorStop(2 / 7, '#ffff00');
lingrad.addColorStop(3 / 7, '#00ff00');
lingrad.addColorStop(4 / 7, '#00ffff');
lingrad.addColorStop(5 / 7, '#0000ff');
lingrad.addColorStop(6 / 7, '#ff00ff');
lingrad.addColorStop(1, '#ff0000');
ctx.fillStyle = lingrad;
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ctx.fillRect(0, 0, 300, 200);
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<canvas id="canvas" style="border: 1px solid #999;" width="300" height="200"></canvas>
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