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html5_canvas
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渐变createLinearGradient.html

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
<body>
    <canvas id="canvas"></canvas>
    <script src="initCanvas.js"></script>
    <script>
        var lineargradient = context.createLinearGradient(0,0,0,canvas.height())
        lineargradient.addColorStop(0, "#000000")
        lineargradient.addColorStop(1, "#ffffff")

        var radialGradient = context.createRadialGradient(canvas.width()/2,canvas.height()/2,0,canvas.width()/2,canvas.height()/2,200);
        radialGradient.addColorStop(0, 'rgb(0,0,0)')
        radialGradient.addColorStop(1, 'rgb(150,150,150)')

        context.fillStyle=radialGradient
        context.fillRect(0,0,canvas.width(),canvas.height())
    </script>
</body>
</html>