# 自定义过滤器
两种方式
* module.filter(name, filterFactory)
* @$filterProvider.register().
**例子：** index.html
```markup
filterAge:
-
{{user.name}}
{{user.age}}
{{user.city}}
filterCity:
-
{{user.name}}
{{user.age}}
{{user.city}}
```
app/index.js
```javascript
var myApp = angular.module('myApp', [], function ($filterProvider, $provide, $controllerProvider) {
$provide.service('Data', function () {
return [
{
name: '张三',
age: '20',
city: '上海'
},
{
name: '李四',
age: '30',
city: '北京'
}
];
});
//$filterProvider.register方式
$filterProvider.register('filterAge', function () {
return function (obj) {
var newObj = [];
angular.forEach(obj, function (o) {
if (o.age > 20) {
newObj.push(o);
}
});
return newObj;
}
});
$controllerProvider.register('firstController', function ($scope, Data) {
$scope.data = Data;
})
})
// module.filter方式
.filter('filterCity',function(){
return function(obj){
var newObj = [];
angular.forEach(obj, function (o) {
if (o.city === '上海') {
newObj.push(o);
}
});
return newObj;
}
})
```
**效果：**
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