update zh-cn/application-dev/media/image-tool.md.

Signed-off-by: N 朱静茹 <zhujingru2@huawei.com>

update zh-cn/application-dev/media/image-tool.md.
Signed-off-by: N 朱静茹 <zhujingru2@huawei.com>
8294c8c3 · 朱静茹 · Gitee · c59a93fa · 8294c8c3
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zh-cn/application-dev/media/image-tool.md zh-cn/application-dev/media/image-tool.md +1 -1

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--- a/zh-cn/application-dev/media/image-tool.md
+++ b/zh-cn/application-dev/media/image-tool.md
@@ -37,7 +37,7 @@ EXIF信息的读取与编辑相关API的详细介绍请参见[API参考](../refe
   
   // 编辑EXIF信息
   imageSource.modifyImageProperty('ImageWidth', '120').then(() => {
-     const width : number = imageSource.getImageProperty("ImageWidth");
+     const width : Promise<string> = imageSource.getImageProperty("ImageWidth");
     console.info('The new imageWidth is ' + width);
   })
   ```