ChangeDetectorRef.detectChanges()通常是最专注的方法。ApplicationRef.tick()通常是一种大锤式的方法。

要使用ChangeDetectorRef.detectChanges()，你需要在你的组件顶部:

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

．.． 然后，通常当你在构造函数中注入它时，你会给它添加别名，就像这样:

构造函数(private cdr: ChangeDetectorRef){…｝

然后，在适当的地方，像这样调用它:

this.cdr.detectChanges();

Where you call ChangeDetectorRef.detectChanges() can be highly significant. You need to completely understand the life cycle and exactly how your application is functioning and rendering its components. There's no substitute here for completely doing your homework and making sure you understand the Angular lifecycle inside out. Then, once you understand that, you can use ChangeDetectorRef.detectChanges() appropriately (sometimes it's very easy to understand where you should use it, other times it can be very complex).

我使用*ngIf强制重载组件。

容器中的所有组件都返回到完整生命周期钩子。

在模板中:

<ng-container *ngIf="_reload">
    components here 
</ng-container>

然后在ts文件中:

public _reload = true;

private reload() {
    setTimeout(() => this._reload = false);
    setTimeout(() => this._reload = true);
}

tx，发现我需要的解决方案:

  constructor(private zone:NgZone) {
    // enable to for time travel
    this.appStore.subscribe((state) => {
        this.zone.run(() => {
            console.log('enabled time travel');
        });
    });

运行zone.run将强制组件重新呈现

ChangeDetectorRef.detectChanges()通常是最专注的方法。ApplicationRef.tick()通常是一种大锤式的方法。

要使用ChangeDetectorRef.detectChanges()，你需要在你的组件顶部:

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

．.． 然后，通常当你在构造函数中注入它时，你会给它添加别名，就像这样:

构造函数(private cdr: ChangeDetectorRef){…｝

然后，在适当的地方，像这样调用它:

this.cdr.detectChanges();

Where you call ChangeDetectorRef.detectChanges() can be highly significant. You need to completely understand the life cycle and exactly how your application is functioning and rendering its components. There's no substitute here for completely doing your homework and making sure you understand the Angular lifecycle inside out. Then, once you understand that, you can use ChangeDetectorRef.detectChanges() appropriately (sometimes it's very easy to understand where you should use it, other times it can be very complex).

呈现发生在变更检测之后。要强制更改检测，以便组件属性值的更改被传播到DOM(然后浏览器将在视图中呈现这些更改)，以下是一些选项:

ApplicationRef.tick()——类似于Angular 1的$rootScope.$digest()——即检查完整的组件树 NgZone.run(回调)——类似于$rootScope.$apply(回调)——也就是说，计算Angular 2 zone内的回调函数。我认为，但我不确定，在执行回调函数后，这最终会检查完整的组件树。 ChangeDetectorRef.detectChanges()——类似于$scope.$digest()——也就是说，只检查这个组件及其子组件

你需要导入并注入ApplicationRef, NgZone或ChangeDetectorRef到你的组件中。

对于您的特定场景，如果只更改了一个组件，我建议使用最后一个选项。

ChangeDetectorRef方法

import { Component, OnInit, ChangeDetectorRef } from '@angular/core';

export class MyComponent {

    constructor(private cdr: ChangeDetectorRef) { }

    selected(item: any) {
        if (item == 'Department')
            this.isDepartment = true;
        else
            this.isDepartment = false;
        this.cdr.detectChanges();
    }

}