diff --git a/docs/api/canvas/canvasPutImageData.md b/docs/api/canvas/canvasPutImageData.md
index 4a9ff2c9ebc51905ef00f6d623561475f9e882cb..2a293ad8830b63b0c7a714af6eceee4def039946 100644
--- a/docs/api/canvas/canvasPutImageData.md
+++ b/docs/api/canvas/canvasPutImageData.md
@@ -19,7 +19,7 @@
 **示例代码**
 
 ```javascript
-const data = new Uint8ClampedArray([255, 0, 0, 1])
+const data = new Uint8ClampedArray([255, 0, 0, 255])
 uni.canvasPutImageData({
   canvasId: 'myCanvas',
   x: 0,