updated docs

Signed-off-by: Nwusongqing <wusongqing@huawei.com>

en/application-dev/reference/apis/js-apis-zlib.md

 # Zip Module (JavaScript SDK APIs)
 
-## Constraints
-None
 ## Modules to Import
 
 ```javascript
@@ -9,7 +7,7 @@ import zlib from '@ohos.zlib';
 ```
 
 ## zlib.zipFile
-zipFile(inFile:string, outFile:string, options: Options): Promise<void>;
+zipFile(inFile:string, outFile:string, options: Options): Promise\<void>
 Zips a file. This API uses a promise to return the result.
 
 **System capability**: SystemCapability.BundleManager.Zlib
@@ -36,17 +34,14 @@ Zips a file. This API uses a promise to return the result.
 import zlib from '@ohos.zlib'
 var inFile = "/xxx/filename.xxx";
 var outFile = "/xxx/xxx.zip";
-var options = {};
-options.level = zlib.CompressLevel.COMPRESS_LEVEL_DEFAULT_COMPRESSION;
-options.memLevel = zlib.MemLevel.MEM_LEVEL_DEFAULT;
-options.strategy = zlib.CompressStrategy.COMPRESS_STRATEGY_DEFAULT_STRATEGY;
+var options = {
+  level: zlib.CompressLevel.COMPRESS_LEVEL_DEFAULT_COMPRESSION,
+  memLevel: zlib.MemLevel.MEM_LEVEL_DEFAULT,
+  strategy: zlib.CompressStrategy.COMPRESS_STRATEGY_DEFAULT_STRATEGY
+};
 
 zlib.zipFile(inFile, outFile, options).then((data) => {
-    if (data == zlib.ErrorCode.ERROR_CODE_OK) {
-        console.log("zipFile OK");
-    } else {
-        console.log("zipFile NG");
-    }
+    console.log("zipFile result: " + data);
 }).catch((err)=>{
     console.log("catch((err)=>" + err);
 });
@@ -60,17 +55,14 @@ zlib.zipFile(inFile, outFile, options).then((data) => {
 import zlib from '@ohos.zlib'
 var inFile = "/xxx/xxx";
 var outFile = "/xxx/xxx.zip";
-var options = {};
-options.level = zlib.CompressLevel.COMPRESS_LEVEL_DEFAULT_COMPRESSION;
-options.memLevel = zlib.MemLevel.MEM_LEVEL_DEFAULT;
-options.strategy = zlib.CompressStrategy.COMPRESS_STRATEGY_DEFAULT_STRATEGY;
-
-zlib.zipFile(inFile , unzipDir, options).then((data) => {
-    if (data == zlib.ErrorCode.ERROR_CODE_OK) {
-        console.log("zipFile OK");
-    } else {
-        console.log("zipFile NG");
-    }
+var options = {
+  level: zlib.CompressLevel.COMPRESS_LEVEL_DEFAULT_COMPRESSION,
+  memLevel: zlib.MemLevel.MEM_LEVEL_DEFAULT,
+  strategy: zlib.CompressStrategy.COMPRESS_STRATEGY_DEFAULT_STRATEGY
+};
+
+zlib.zipFile(inFile , outFile, options).then((data) => {
+    console.log("zipFile result: " + data);
 }).catch((err)=>{
     console.log("catch((err)=>" + err);
 });
@@ -78,7 +70,7 @@ zlib.zipFile(inFile , unzipDir, options).then((data) => {
 
 ## zlib.unzipFile
 
-unzipFile(inFile:string, outFile:string, options: Options): Promise<void>;
+unzipFile(inFile:string, outFile:string, options: Options): Promise\<void>
 
 Unzips a file. This API uses a promise to return the result.
 
@@ -88,7 +80,7 @@ Unzips a file. This API uses a promise to return the result.
 
 | Name   | Type                               | Mandatory| Description                               |
 | ------- | ----------------------------------- | ---- | ----------------------------------- |
-| inFile  | string                              | Yes  | Path of the file to unzip. The file name extension is .zip.|
+| inFile  | string                              | Yes  | Path of the .zip file to unzip.|
 | outFile | string                              | Yes  | Path of the unzipped file.                 |
 | options | [Options](#options)| No  | Optional parameters for the unzip operation.                     |
 
@@ -106,30 +98,26 @@ import zlib from '@ohos.zlib'
 var inFile = "/xx/xxx.zip";
 var outFile = "/xxx";
 
-var options = {};
-options.level = zlib.CompressLevel.COMPRESS_LEVEL_DEFAULT_COMPRESSION;
-options.memLevel = zlib.MemLevel.MEM_LEVEL_DEFAULT;
-options.strategy = zlib.CompressStrategy.COMPRESS_STRATEGY_DEFAULT_STRATEGY;
-
+let options = {
+  level: zlib.CompressLevel.COMPRESS_LEVEL_DEFAULT_COMPRESSION,
+  memLevel: zlib.MemLevel.MEM_LEVEL_DEFAULT,
+  strategy: zlib.CompressStrategy.COMPRESS_STRATEGY_DEFAULT_STRATEGY
+};
 zlib.unzipFile(inFile, outFile, options).then((data) => {
-    if (data == zlib.ErrorCode.ERROR_CODE_OK) {
-        console.log("unzipFile OK");
-    } else {
-        console.log("unzipFile NG");
-    }
+    console.log("unzipFile result: " + data);
 }).catch((err)=>{
     console.log("catch((err)=>" + err);
 })
 	
 ```
 
-## options
+## Options
 
 | Name                       | Description                                                        |
 | --------------------------- | ------------------------------------------------------------ |
-| level?: CompressLeve        | See [zip.CompressLevel](##zipcompresslevel). |
-| memLevel?: MemLevel         | See [zip.MemLevel](#zipmemlevel) |
-| strategy?: CompressStrategy | See [zip.CompressStrategy](#zipcompressstrategy) |
+| level?: CompressLeve        | See [zip.CompressLevel](#zipcompresslevel).|
+| memLevel?: MemLevel         | See [zip.MemLevel](#zipmemlevel).       |
+| strategy?: CompressStrategy | See [zip.CompressStrategy](#zipcompressstrategy).|
 
 ## zip.MemLevel
 
@@ -143,24 +131,24 @@ zlib.unzipFile(inFile, outFile, options).then((data) => {
 
 | Name                                   | Description             |
 | --------------------------------------- | ----------------- |
-| COMPRESS_LEVEL_NO_COMPRESSION : 0       | Compress level 0 that indicates uncompressed.|
-| COMPRESS_LEVEL_BEST_SPEED : 1           | Compression level 1 that gives the best speed. |
-| COMPRESS_LEVEL_BEST_COMPRESSION :9      | Compression level 9 that gives the best compression.     |
-| COMPRESS_LEVEL_DEFAULT_COMPRESSION : -1| Default compression level.     |
+| COMPRESS_LEVEL_NO_COMPRESSION: 0       | Compress level 0 that indicates uncompressed.|
+| COMPRESS_LEVEL_BEST_SPEED: 1          | Compression level 1 that gives the best speed. |
+| COMPRESS_LEVEL_BEST_COMPRESSION: 9     | Compression level 9 that gives the best compression.     |
+| COMPRESS_LEVEL_DEFAULT_COMPRESSION: -1| Default compression level.     |
 
 ## Zip.CompressStrategy
 
 | Name                                  | Description                    |
 | -------------------------------------- | ------------------------ |
-| COMPRESS_STRATEGY_DEFAULT_STRATEGY : 0 | Default compression strategy.            |
-| COMPRESS_STRATEGY_FILTERED : 1         | Filtered compression strategy.|
-| COMPRESS_STRATEGY_HUFFMAN_ONLY : 2     | Huffman coding compression strategy.  |
-| COMPRESS_STRATEGY_RLE : 3              | RLE compression strategy.        |
-| COMPRESS_STRATEGY_FIXED : 4            | Fixed compression strategy.          |
+| COMPRESS_STRATEGY_DEFAULT_STRATEGY: 0 | Default compression strategy.            |
+| COMPRESS_STRATEGY_FILTERED: 1        | Filtered compression strategy.|
+| COMPRESS_STRATEGY_HUFFMAN_ONLY: 2    | Huffman coding compression strategy.  |
+| COMPRESS_STRATEGY_RLE: 3             | RLE compression strategy.        |
+| COMPRESS_STRATEGY_FIXED: 4           | Fixed compression strategy.          |
 
 ## zip.ErrorCode
 
 | Name                | Description        |
 | -------------------- | ------------ |
 | ERROR_CODE_OK: 0    | The API is successfully called.|
-| ERROR_CODE_ERRNO:- 1 | Failed to call the API.|
+| ERROR_CODE_ERRNO: -1| Failed to call the API.|