创建了一个简单的示例程序来显示在更大的应用程序中出现的问题。在 angular.json 中启用 buildOptimizer 和 Optimization 时,类型名称变为相同的字符。
当按下按钮时,这个简单的应用程序会在主应用程序模板中注入一个动态组件。它为从基础组件派生的每个组件都有一个工厂。第三个工厂只存储最后一个使用的。
import {
Component,
ComponentFactory,
ComponentFactoryResolver,
OnInit,
ViewChild,
ViewContainerRef,
} from '@angular/core';
import { AbcComponent } from './abc.component';
import { BaseComponent } from './base.component';
import { XyzComponent } from './xyz.component';
@Component({
selector: 'app-root',
template: `<div>
<ng-container #panelContainer></ng-container>
</div>
<div>
<button (click)="switchComponents()">Switch</button>
</div>`,
})
export class AppComponent {
constructor(private componentFactoryResolver: ComponentFactoryResolver) {
this.abcFactory =
this.componentFactoryResolver.resolveComponentFactory(AbcComponent);
this.xyzFactory =
this.componentFactoryResolver.resolveComponentFactory(XyzComponent);
this.currentFactory = this.xyzFactory;
}
abcFactory: ComponentFactory<AbcComponent>;
xyzFactory: ComponentFactory<XyzComponent>;
currentFactory: ComponentFactory<BaseComponent>;
@ViewChild('panelContainer', { read: ViewContainerRef }) panelContainerRef:
| ViewContainerRef
| undefined;
public switchComponents() {
console.log(
'this.currentFactory.componentType.name',
this.currentFactory.componentType.name
);
if (this.currentFactory.componentType.name == AbcComponent.name) {
this.currentFactory = this.xyzFactory;
} else {
this.currentFactory = this.abcFactory;
}
this.panelContainerRef?.detach();
this.panelContainerRef?.createComponent(this.currentFactory);
}
}
成分:
import { Component, OnInit } from '@angular/core';
@Component({
selector: 'app-base',
template: '',
})
export class BaseComponent implements OnInit {
constructor() {}
ngOnInit(): void {}
}
import { Component, OnInit } from '@angular/core';
import { BaseComponent } from './base.component';
@Component({
selector: 'app-abc',
template: '<p>abc works!</p>',
})
export class AbcComponent extends BaseComponent implements OnInit {
constructor() {
super();
}
ngOnInit(): void {}
}
import { Component, OnInit } from '@angular/core';
import { BaseComponent } from './base.component';
@Component({
selector: 'app-xyz',
template: '<p>xyz works!</p>',
})
export class XyzComponent extends BaseComponent implements OnInit {
constructor() {
super();
}
ngOnInit(): void {}
}
Angular.json 如果我禁用 buildOptimizer 或优化选项,一切正常。
{
"$schema": "./node_modules/@angular/cli/lib/config/schema.json",
"cli": {
"analytics": "d4d75b0f-c55f-4714-97d7-e08572c4c65f"
},
"version": 1,
"newProjectRoot": "projects",
"projects": {
"esbuildTestApp": {
"projectType": "application",
"schematics": {
"@schematics/angular:component": {
"style": "scss"
},
"@schematics/angular:application": {
"strict": true
}
},
"root": "",
"sourceRoot": "src",
"prefix": "app",
"architect": {
"build": {
"builder": "@angular-devkit/build-angular:browser",
"options": {
"outputPath": "dist/esbuildTestApp",
"index": "src/index.html",
"main": "src/main.ts",
"polyfills": "src/polyfills.ts",
"tsConfig": "tsconfig.app.json",
"inlineStyleLanguage": "scss",
"assets": ["src/favicon.ico", "src/assets"],
"styles": ["src/styles.scss"],
"scripts": []
},
"configurations": {
"production": {
"budgets": [
{
"type": "initial",
"maximumWarning": "500kb",
"maximumError": "1mb"
},
{
"type": "anyComponentStyle",
"maximumWarning": "2kb",
"maximumError": "4kb"
}
],
"fileReplacements": [
{
"replace": "src/environments/environment.ts",
"with": "src/environments/environment.prod.ts"
}
],
"outputHashing": "all"
},
"development": {
"buildOptimizer": false,
"optimization": true,
"vendorChunk": true,
"extractLicenses": false,
"sourceMap": true,
"namedChunks": true,
"aot": true
}
},
"defaultConfiguration": "production"
},
"serve": {
"builder": "@angular-devkit/build-angular:dev-server",
"configurations": {
"production": {
"browserTarget": "esbuildTestApp:build:production"
},
"development": {
"browserTarget": "esbuildTestApp:build:development"
}
},
"defaultConfiguration": "development"
},
"extract-i18n": {
"builder": "@angular-devkit/build-angular:extract-i18n",
"options": {
"browserTarget": "esbuildTestApp:build"
}
},
"test": {
"builder": "@angular-devkit/build-angular:karma",
"options": {
"main": "src/test.ts",
"polyfills": "src/polyfills.ts",
"tsConfig": "tsconfig.spec.json",
"karmaConfig": "karma.conf.js",
"inlineStyleLanguage": "scss",
"assets": ["src/favicon.ico", "src/assets"],
"styles": ["src/styles.scss"],
"scripts": []
}
}
}
}
},
"defaultProject": "esbuildTestApp"
}
在禁用优化之一的情况下进行调试
this.currentFactory.componentType.name s
app.component.ts:40 this.currentFactory.componentType.name o
app.component.ts:40 this.currentFactory.componentType.name s
app.component.ts:40 this.currentFactory.componentType.name o
如果启用两者,如下所示:
"development": {
"buildOptimizer": true,
"optimization": true,
"vendorChunk": true,
"extractLicenses": false,
"sourceMap": true,
"namedChunks": true,
"aot": true
}
输出显示所有类的名称相同。所有优化:
app.component.ts:40 this.currentFactory.componentType.name e
app.component.ts:40 this.currentFactory.componentType.name e
app.component.ts:40 this.currentFactory.componentType.name e