# app.js
## Application Lifecycle
You can customize the [lifecycle](js-framework-lifecycle.md) implementation logic on an application-by-application basis in **app.js**. The following example only prints the corresponding logs in the **lifecycle** function:
```
// app.js
export default {
onCreate() {
console.info('Application onCreate');
},
onDestroy() {
console.info('Application onDestroy');
},
}
```
## Application Object6+
Attribute
Data Type
Description
getApp
Function
Obtains the object exposed in the app.js file from the custom .js file.
The following is a sample code snippet:
```
// app.js
export default {
data: {
test: "by getAPP"
},
onCreate() {
console.info('AceApplication onCreate');
},
onDestroy() {
console.info('AceApplication onDestroy');
},
};
```
```
// test.js Customize the logic code.
export var appData = getApp().data;
```