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                ## 第七課時:陰影 以下屬性用于設置陰影。 * `CanvasRenderingContext2D.shadowBlur`:陰影的模糊程度,默認為`0`。 * `CanvasRenderingContext2D.shadowColor`:陰影的顏色,默認為`black`。 * `CanvasRenderingContext2D.shadowOffsetX`:陰影的水平位移,默認為`0`。 * `CanvasRenderingContext2D.shadowOffsetY`:陰影的垂直位移,默認為`0`。 下面是一個例子。 ~~~ var canvas = document.getElementById('myCanvas'); var ctx = canvas.getContext('2d'); ctx.shadowOffsetX = 10; ctx.shadowOffsetY = 10; ctx.shadowBlur = 5; ctx.shadowColor = 'rgba(0,0,0,0.5)'; ctx.fillStyle = 'green'; ctx.fillRect(10, 10, 100, 100); ~~~
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