> For the complete documentation index, see [llms.txt](https://xiaoxiami.gitbook.io/angularjs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://xiaoxiami.gitbook.io/angularjs/module-li-qi-ta-fang-fa/constantvaluerunfang_fa.md).
# constant、value、run方法
## constant
* constant(name,object)
* 此方法首先运行，可以用它来声明整个应用范围内的常量，并且让它们在所有配置(config方法里)和实例(controller,service等)方法中都可用
## value
* value(name,object)
* 如果只想在服务内得到一些内容，可以通过value来申明常量
## run
* run(initializationFn)
* 想要在注入启动之后执行某些操作，⽽而这些操作需要在页面对用户可用之前执行，可以使用此方法
* 比如加载远程的模版，需要在使用前放入缓存，或者在使用操作前判断用户是否登录，未登录可以先去登陆页面
**例子：**
index.html
```markup
```
app/index.js
```javascript
angular.module('myApp',[],['$provide',function($provide){
console.log('config');
// $provide.factory
// $provide.service
// $provide.constant
// $provide.value;
}])
.config(function(APIKEY){
console.log(APIKEY);
console.log('config');
})
// 在config之后controller等其他服务之前。。
.run(function(){
console.log('run');
})
// 它只是可以注入任何方法
.constant('APIKEY','xxxx')
// 只能注入controller...service factory
.value('vension','1.0.0')
.controller('firstController',['APIKEY','vension',function(APIKEY,vension){
console.log(APIKEY);
console.log(vension);
console.log('controller');
}]);
```
---
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