diff --git a/zh-cn/application-dev/reference/apis/js-apis-image.md b/zh-cn/application-dev/reference/apis/js-apis-image.md
index db4034387880d458079ffb588a066792e390a829..385dd30e900eb0cb2eb28160485a95446e0562fa 100644
--- a/zh-cn/application-dev/reference/apis/js-apis-image.md
+++ b/zh-cn/application-dev/reference/apis/js-apis-image.md
@@ -171,7 +171,7 @@ readPixels(area: PositionArea): Promise\<void>
 **示例:**
 
 ```js
-const area image.PositionArea = {
+const area : image.PositionArea = {
     pixels: new ArrayBuffer(8),
     offset: 0,
     stride: 8,