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docs(canvas): fix typo
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docs/canvas.md

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@@ -502,7 +502,7 @@ function drawImageActualSize() {
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ctx.getImageData(sx, sy, sw, sh)
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```
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`getImageData()`方法接受四个参数。`sx``sy`是读取区域的左上角坐标,`sw``sy`是读取区域的宽度和高度。如果想要读取整个`<canvas>`区域,可以写成下面这样。
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`getImageData()`方法接受四个参数。`sx``sy`是读取区域的左上角坐标,`sw``sh`是读取区域的宽度和高度。如果想要读取整个`<canvas>`区域,可以写成下面这样。
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```javascript
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var canvas = document.getElementById('myCanvas');

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