如何调用动态创建组件的构造函数?

Angular中使用ComponentFactoryResolver可以动态地创建组件并获取对组件实例的引用。当然，在动态创建组件实例之前，需要先调用构造函数来初始化组件。可以通过以下步骤实现：

1. 导入ComponentFactoryResolver：

import { ComponentFactoryResolver } from '@angular/core';

2. 通过ComponentFactoryResolver动态获取组件工厂：

constructor(private componentFactoryResolver: ComponentFactoryResolver) {}

// 假设要动态创建名为MyComponent的组件 const factory = this.componentFactoryResolver.resolveComponentFactory(MyComponent);

3. 通过ComponentFactory创建组件实例：

const componentRef = factory.create(this.injector); // injector可通过依赖注入获取

4. 获取对组件实例的引用：

const instance = componentRef.instance;

5. 手动调用组件构造函数:

instance.constructor();

示例代码如下：

import { Component, OnInit, ViewChild, ViewContainerRef, ComponentFactoryResolver, Injector } from '@angular/core';

@Component({ selector: 'app-root', template: <ng-template #container></ng-template> }) export class AppComponent implements OnInit {

@ViewChild('container', { read: ViewContainerRef }) container: ViewContainerRef;

constructor(private componentFactoryResolver: ComponentFactoryResolver, private injector: Injector) { }

ngOnInit() {

// 动态创建MyComponent组件
const factory = this.componentFactoryResolver.resolveComponentFactory(MyComponent);
const componentRef = factory.create(this.injector);

// 手动调用构造函数
const instance = componentRef.instance;
instance.constructor();

// 将组件添加到容器中
this.container.insert(componentRef.hostView);

}

}

@Component({ selector: 'app-my-component', template: 'Hello World' }) export class MyComponent {

constructor() { console.log('MyComponent构造函数被调用'); }

}