JavaScript 绘制线性渐变

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<!doctype html>
<html>
<head>
    <meta charset="utf-8">
</head>
<body>
    <canvas id="myCanvas" width="300" height="200"></canvas>
    <script type="text/javascript">
        var ctx = document.getElementById('myCanvas').getContext('2d');
        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;
        ctx.strokeStyle = lingrad;
        ctx.fillRect(10, 10, 200, 200);

    </script>
</body>
</html>

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转载自blog.csdn.net/sakenc/article/details/92118175