diff --git a/docs/api/canvas/CanvasContext.md b/docs/api/canvas/CanvasContext.md
index 74cc602dd17c5ab794a466ad73d8efface3602a9..366dea94ceef39229a64157dee3b90c8f7631a61 100644
--- a/docs/api/canvas/CanvasContext.md
+++ b/docs/api/canvas/CanvasContext.md
@@ -292,7 +292,7 @@ ctx.draw()
 clearRect 并非画一个白色的矩形在地址区域，而是清空，为了有直观感受，对 canvas 加了一层背景色。
 
 ```javascript
-<canvas canvas-id="myCanvas" style="border: 1px solid; background: #123456;"/>
+<canvas canvas-id="myCanvas" id="myCanvas" style="border: 1px solid; background: #123456;"/>
 ```
 
 ```javascript
diff --git a/docs/api/canvas/canvasGetImageData.md b/docs/api/canvas/canvasGetImageData.md
index 97fca33025df855120c0f730642b82c0bf0c1912..d666540b47da625cba2d0f0cdaf6aa25d655bca8 100644
--- a/docs/api/canvas/canvasGetImageData.md
+++ b/docs/api/canvas/canvasGetImageData.md
@@ -6,7 +6,7 @@
 
 |参数|类型|必填|说明|
 |---|---|---|---|
-|canvasId|String|是|画布标识，传入 ```<canvas />``` 的 canvas-id|
+|canvasId|String|是|画布标识，传入 ```<canvas />``` 的 canvas-id（支付宝小程序是id、其他平台是canvas-id）|
 |x|Number|是|将要被提取的图像数据矩形区域的左上角 x 坐标|
 |y|Number|是|将要被提取的图像数据矩形区域的左上角 y 坐标|
 |width|Number|是|将要被提取的图像数据矩形区域的宽度|
diff --git a/docs/api/canvas/canvasPutImageData.md b/docs/api/canvas/canvasPutImageData.md
index 2a293ad8830b63b0c7a714af6eceee4def039946..c448c87bec51b84fd7bc0618dfae53ffb0cbda2b 100644
--- a/docs/api/canvas/canvasPutImageData.md
+++ b/docs/api/canvas/canvasPutImageData.md
@@ -6,7 +6,7 @@
 
 |参数|类型|必填|说明|最低版本|
 |---|---|---|---|--|
-|canvasId|String|是|画布标识，传入 ```<canvas />``` 的 canvas-id||
+|canvasId|String|是|画布标识，传入 ```<canvas />``` 的 canvas-id（支付宝小程序是id、其他平台是canvas-id）||
 |data|Uint8ClampedArray|是|图像像素点数据，一维数组，每四项表示一个像素点的rgba||
 |x|Number|是|源图像数据在目标画布中的位置偏移量（x 轴方向的偏移量）||
 |y|Number|是|源图像数据在目标画布中的位置偏移量（y 轴方向的偏移量）||
diff --git a/docs/api/canvas/canvasToTempFilePath.md b/docs/api/canvas/canvasToTempFilePath.md
index 3ab194c499edca55dad6d379213a83e9b89477aa..5bd0877350969d16d6cfe962f255c39a5bbaa84a 100644
--- a/docs/api/canvas/canvasToTempFilePath.md
+++ b/docs/api/canvas/canvasToTempFilePath.md
@@ -18,7 +18,7 @@
 |height	|Number		|否			|画布高度（默认为canvas高度-y）|					
 |destWidth	|Number		|否			|输出图片宽度（默认为 width * 屏幕像素密度）|					
 |destHeight	|Number		|否			|输出图片高度（默认为 height * 屏幕像素密度）|					
-|canvasId	|String		|是			|画布标识，传入 ``<canvas/>`` 的 canvas-id|						
+|canvasId	|String		|是			|画布标识，传入 ``<canvas/>`` 的 canvas-id（支付宝小程序是id、其他平台是canvas-id）|						
 |fileType	|String		|否			|目标文件的类型，只支持 'jpg' 或 'png'。默认为 'png'|		
 |quality	|Number		|否			|图片的质量，取值范围为 (0, 1]，不在范围内时当作1.0处理|		
 |success	|Function	|否			|接口调用成功的回调函数|						
diff --git a/docs/api/canvas/createCanvasContext.md b/docs/api/canvas/createCanvasContext.md
index 805096e5ced1f07e91006313666caf865727fff1..0d8cc1ffe371fea9e0b1c7c5eb62c1b38a5c96bb 100644
--- a/docs/api/canvas/createCanvasContext.md
+++ b/docs/api/canvas/createCanvasContext.md
@@ -4,14 +4,14 @@
 
 创建 ```canvas``` 绘图上下文（指定 canvasId）。在自定义组件下，第二个参数传入组件实例this，以操作组件内 ```<canvas/>``` 组件
 
-**Tip:** 需要指定 canvasId，该绘图上下文只作用于对应的 ```<canvas/>```
+**Tip:** 需要指定 canvasId，该绘图上下文只作用于对应的 `<canvas/>`
 
 #### 参数
 
 |参数|类型|说明|
 |----|----|-----|
-|canvasId|String	|画布表示，传入定义在 ```<canvas/>``` 的 canvas-id	|
-|componentInstance|Object	|自定义组件实例 this ，表示在这个自定义组件下查找拥有 canvas-id 的 ```<canvas/>``` ，如果省略，则不在任何自定义组件内查找	|
+|canvasId|String	|画布表示，传入定义在 `<canvas/>` 的 canvas-id或id（支付宝小程序是id、其他平台是canvas-id）	|
+|componentInstance|Object	|自定义组件实例 this ，表示在这个自定义组件下查找拥有 canvas-id 的 `<canvas/>` ，如果省略，则不在任何自定义组件内查找	|
 
 #### 返回值
 
diff --git a/docs/component/canvas.md b/docs/component/canvas.md
index 884084daa4cbde08a7bc5170b028906ffa5fbf9d..37b015fcc053fa4468087b749763db010a0b313e 100644
--- a/docs/component/canvas.md
+++ b/docs/component/canvas.md
@@ -30,9 +30,9 @@
 ```html
 <template>
 	<view>
-		<canvas style="width: 300px; height: 200px;" canvas-id="firstCanvas"></canvas>
-		<canvas style="width: 400px; height: 500px;" canvas-id="secondCanvas"></canvas>
-		<canvas style="width: 400px; height: 500px;" canvas-id="secondCanvas" @error="canvasIdErrorCallback"></canvas>
+		<canvas style="width: 300px; height: 200px;" canvas-id="firstCanvas" id="firstCanvas"></canvas>
+		<canvas style="width: 400px; height: 500px;" canvas-id="secondCanvas" id="secondCanvas"></canvas>
+		<canvas style="width: 400px; height: 500px;" canvas-id="secondCanvas" id="secondCanvas" @error="canvasIdErrorCallback"></canvas>
 	</view>
 </template>
 ```