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                            ## OnInit

生命周期鉤子，在指令的數據綁定屬性初始化后觸發。

`ngOnInit`在第一次檢查指令的數據綁定屬性之后，在檢查其任何子節點之前調用。當指令被實例化時，它只被調用一次。

```typescript
@Component({ selector: 'my-cmp', template: `...` })
export MyComponent implements OnInit {
  ngOnInit() {
    // ...
  }
}
```

### 類定義

```typescript
class OnInit {
  ngOnInit() : void
}
```

### 屬性

- ngOnInit() : `void`











                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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