Angular2 传递函数作为组件输入不起作用

### 解决 Angular2 中传递函数作为组件输入不起作用的问题

typescript
// 父组件 ParentComponent
import { Component } from '@angular/core';
@Component({
  selector: 'app-parent',
  template: `
    
  `
})
export class ParentComponent {
  doSomething() {
    console.log('执行了 doSomething 函数');
  }
}
// 子组件 ChildComponent
import { Component, Input } from '@angular/core';
@Component({
  selector: 'app-child',
  template: `
    执行函数
  `
})
export class ChildComponent {
  @Input() customFunction!: Function;
  executeFunction() {
    if (this.customFunction) {
      this.customFunction();
    }
  }
}

typescript
// 父组件 ParentComponent
import { Component } from '@angular/core';
@Component({
  selector: 'app-parent',
  template: `
    
  `
})
export class ParentComponent {
  doSomething = () => {
    console.log('执行了 doSomething 函数');
  };
}

typescript
// 父组件 ParentComponent
import { Component } from '@angular/core';
@Component({
  selector: 'app-parent',
  template: `
    
  `
})
export class ParentComponent {
  doSomething() {
    console.log('执行了 doSomething 函数');
  }
}