x
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<canvas id="canvas" width="300" height="300">
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描述您画布的展示内容的替代文字。
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</canvas>
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<script>
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var canvas = document.getElementById('canvas');
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var ctx = canvas.getContext('2d');
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ctx.fillStyle = 'green';
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ctx.fillRect(0, 0, 80, 100);
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</script>
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