update apis

Signed-off-by: Nzhangxingxia <zhangxingxia1@huawei.com>

zh-cn/application-dev/reference/apis/js-apis-environment.md

@@ -29,9 +29,9 @@ getStorageDataDir():Promise<string>
 
   ```js
   environment.getStorageDataDir().then(function(path){
-  	// do something
+      console.info("getStorageDataDir successfully:"+ path);
   }).catch(function(error){
-      
+      console.info("getStorageDataDir failed with error:"+ error);
   });
   ```
 
@@ -71,9 +71,9 @@ getUserDataDir():Promise<string>
 
   ```js
   environment.getUserDataDir().then(function(path){
-  	// do something
+      console.info("getUserDataDir successfully:"+ path);
   }).catch(function(error){
-      
+      console.info("getUserDataDir failed with error:"+ error);
   });
   ```
 

zh-cn/application-dev/reference/apis/js-apis-filemanager.md

@@ -4,7 +4,7 @@
 ## 导入模块
 
 ```js
-import filemanager from 'ohos.filemanager'
+import filemanager from 'ohos.filemanager';
 ```
 
 ## 系统能力
@@ -31,17 +31,15 @@ getRoot(options? : {dev? : DevInfo}) : Promise<FileInfo[]>
 - 示例
 
 ```js
-filemanager.getRoot()
-.then((fileInfo) => {
+filemanager.getRoot().then((fileInfo) => {
     if(Array.isArray(fileInfo)) {
         for (var i = 0; i < fileInfo.length; i++) {
             console.log(JSON.Stringify(fileInfo))
         }
     }
-})
-.catch((err) => {
+}).catch((err) => {
     console.log(err)
-})
+});
 ```
 
 ## filemanager.getRoot

zh-cn/application-dev/reference/apis/js-apis-statfs.md

@@ -6,7 +6,7 @@
 ## 导入模块
 
 ```js
-import statfs from '@ohos.statfs'
+import statfs from '@ohos.statfs';
 ```
 
 ## 使用说明
@@ -18,7 +18,7 @@ import statfs from '@ohos.statfs'
 通过上述接口获取到应用目录路径dir，文件名为“xxx.txt”，文件所在绝对路径为：
 
 ```js
-let path = dir + "xxx.txt"
+let path = dir + "xxx.txt";
 ```
 
 ## 系统能力
@@ -46,7 +46,12 @@ getFreeBytes(path:string):Promise<number>
 - 示例：
 
   ```js
-  let num = await statfs.getFreeBytes(path);
+  let path = "/data";
+  statfs.getFreeBytes(path).then(function (number){
+      console.info("getFreeBytes successfully:"+ number);
+  }).catch(function(err){
+      console.info("getFreeBytes failed with error:"+ err);
+  });
   ```
 
 ## statfs.getFreeBytes
@@ -91,7 +96,12 @@ getTotalBytes.(path:string):Promise<number>
 - 示例：
 
   ```js
-  let num = await statfs.getTotalBytes(path);
+  let path = "/data";
+  statfs.getTotalBytes(path).then(function (number){
+      console.info("getTotalBytes successfully:"+ number);
+  }).catch(function(err){
+      console.info("getTotalBytes failed with error:"+ err);
+  });
   ```
 
 ## statfs.getTotalBytes