update zh-cn/application-dev/reference/apis/js-apis-plainarray.md.

Signed-off-by: N zengyawen <zengyawen1@huawei.com>

update zh-cn/application-dev/reference/apis/js-apis-plainarray.md.
Signed-off-by: N zengyawen <zengyawen1@huawei.com>
3bdf0dde · zengyawen · Gitee · 46b246bc · 3bdf0dde
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zh-cn/application-dev/reference/apis/js-apis-plainarray.md zh-cn/application-dev/reference/apis/js-apis-plainarray.md +1 -1

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--- a/zh-cn/application-dev/reference/apis/js-apis-plainarray.md
+++ b/zh-cn/application-dev/reference/apis/js-apis-plainarray.md
@@ -153,7 +153,7 @@ getIndexOfKey(key: number): number
 let plainArray = new PlainArray();
 plainArray.add(1, "sddfhf");
 plainArray.add(2, "sffdfhf");
-let result = plainArray.getIndexOfKey("sdfs");
+let result = plainArray.getIndexOfKey(2);
 ```