chore: add some new docs for watch config files

README.md

@@ -273,19 +273,19 @@ myConf := config.NewWithOptions("my-conf", config.ParseEnv, config.ReadOnly)
 
 Now, you can add a hook func for listen config data change. then, you can do something like: write data to file
 
-Add hook func on create config:
+**Add hook func on create config**:
 
 ```go
-	hookFn := func(event string, c *Config) {
-		fmt.Println("fire the:", event)
-	}
+hookFn := func(event string, c *Config) {
+    fmt.Println("fire the:", event)
+}
 
-	c := NewWithOptions("test", WithHookFunc(hookFn))
-	// for global config
-	config.WithOptions(WithHookFunc(hookFn))
+c := NewWithOptions("test", config.WithHookFunc(hookFn))
+// for global config
+config.WithOptions(config.WithHookFunc(hookFn))
 ```
 
-After that, when calling `LoadXXX, Set, SetData, ClearData` etc methods, it will output:
+After that, when calling `LoadXXX, Set, SetData, ClearData` methods, it will output:
 
 ```text
 fire the: load.data
@@ -294,6 +294,23 @@ fire the: set.data
 fire the: clean.data
 ```
 
+### Watch loaded config files
+
+To listen for changes to loaded config files, and reload the config when it changes, you need to use the https://github.com/fsnotify/fsnotify library. 
+For usage, please refer to the example [./_example/watch_file.go](_examples/watch_file.go)
+
+Also, you need to listen to the `reload.data` event:
+
+```go
+config.WithOptions(config.WithHookFunc(func(event string, c *config.Config) {
+    if event == config.OnReloadData {
+        fmt.Println("config reloaded, you can do something ....")
+    }
+}))
+```
+
+When the configuration changes, you can do related things, for example: rebind the configuration to your struct.
+
 ## Dump config data
 
 > Can use `config.DumpTo()` export the configuration data to the specified `writer`, such as: buffer,file
@@ -362,24 +379,24 @@ type Options struct {
 Support parse default value by struct tag `default`
 
 ```go
-	// add option: config.ParseDefault
-	c := config.New("test").WithOptions(config.ParseDefault)
-
-	// only set name
-	c.SetData(map[string]interface{}{
-		"name": "inhere",
-	})
-
-	// age load from default tag
-	type User struct {
-		Age  int `default:"30"`
-		Name string
-		Tags []int
-	}
+// add option: config.ParseDefault
+c := config.New("test").WithOptions(config.ParseDefault)
+
+// only set name
+c.SetData(map[string]interface{}{
+    "name": "inhere",
+})
+
+// age load from default tag
+type User struct {
+    Age  int `default:"30"`
+    Name string
+    Tags []int
+}
 
-	user := &User{}
-	goutil.MustOk(c.Decode(user))
-	dump.Println(user)
+user := &User{}
+goutil.MustOk(c.Decode(user))
+dump.Println(user)
 ```
 
 **Output**:

README.zh-CN.md

@@ -255,9 +255,9 @@ myConf := config.NewWithOptions("my-conf", config.ParseEnv, config.ReadOnly)
 
 ## 监听配置更改
 
-现在，您可以添加一个挂钩函数来监听配置数据更改。然后，您可以执行一些自定义操作, 例如：将数据写入文件
+现在，您可以添加一个钩子函数来监听配置数据更改。然后，您可以执行一些自定义操作, 例如：将数据写入文件
 
-在创建配置时添加钩子函数:
+**在创建配置时添加钩子函数**:
 
 ```go
 hookFn := func(event string, c *Config) {
@@ -269,7 +269,7 @@ c := NewWithOptions("test", WithHookFunc(hookFn))
 config.WithOptions(WithHookFunc(hookFn))
 ```
 
-之后, 当调用 `LoadXXX, Set, SetData, ClearData` 等方法时, 就会输出:
+**之后**, 当调用 `LoadXXX, Set, SetData, ClearData` 等方法时, 就会输出:
 
 ```text
 fire the: load.data
@@ -278,6 +278,23 @@ fire the: set.data
 fire the: clean.data
 ```
 
+### 监听载入的配置文件变动
+
+想要监听载入的配置文件变动，并在变动时重新加载配置，你需要使用 https://github.com/fsnotify/fsnotify 库。
+使用方法可以参考示例 [./_example/watch_file.go](_examples/watch_file.go)
+
+同时，你需要监听 `reload.data` 事件:
+
+```go
+config.WithOptions(config.WithHookFunc(func(event string, c *config.Config) {
+    if event == config.OnReloadData {
+        fmt.Println("config reloaded, you can do something ....")
+    }
+}))
+```
+
+当配置发生变化并重新加载后，你可以做相关的事情，例如：重新绑定配置到你的结构体。
+
 ## 导出配置到文件
 
 > 可以使用 `config.DumpTo(out io.Writer, format string)` 将整个配置数据导出到指定的writer, 比如 buffer,file。

testdata/json_base.json

@@ -2,6 +2,7 @@
   "name": "app",
   "debug": false,
   "baseKey": "value",
+  "key_in_json": "hello jsond",
   "age": 123,
   "envKey": "${SHELL}",
   "envKey1": "${NotExist|defValue}",