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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>慕課網Wiki</title>
<style>
#imooc{
border:1px solid #ccc;
}
</style>
</head>
<body>
<canvas id="imooc">您的瀏覽器不支持 HTML5 canvas 標簽</canvas>
<script>
const canvas = document.getElementById('imooc');
canvas.width=300
canvas.height=100
const ctx = canvas.getContext('2d');
ctx.rect(20,20,50,50)
ctx.fillStyle = "#456795"
// 設置陰影效果
ctx.shadowOffsetX = 10;
ctx.shadowOffsetY = 10;
ctx.shadowColor = "#ccc";
ctx.shadowBlur = 4;
ctx.fill();
// 恢復默認陰影效果
ctx.shadowOffsetX = 0;
ctx.shadowOffsetY = 0;
ctx.shadowBlur = 0;
ctx.fillStyle="yellow"
ctx.fillRect(100,20, 50, 50)
</script>
運行結果