网站建设与管理课后答案,深圳宝安网站建设工,备案审核网站显示500,wordpress仪表盘美化完全基于redux的ngrx方案#xff0c;我们看看在angular中如何实现。通过一个简单的计数器例子梳理下整个流程
一 安装 #xff1a;npm i ngrx/store
这里特别要注意一点#xff1a;安装 ngrx/store的时候会出现和angular版本不一致的问题 所以检查一下angular/core的版本…完全基于redux的ngrx方案我们看看在angular中如何实现。通过一个简单的计数器例子梳理下整个流程
一 安装 npm i ngrx/store
这里特别要注意一点安装 ngrx/store的时候会出现和angular版本不一致的问题 所以检查一下angular/core的版本和ngrx/store的版本是否一致如果不一致升级angular ng update angular/core17.0.0 --force。最好是删除node_modules目录重新下载。保证安装正常版本一致
二 创建store目录并且创建如下几个文件
1actions.ts (2) reducers.ts (3) state.ts
//state.tsexport interface AppState{count:number;
} //actions.ts
export const INSCRESINSCRES
export const DESCRESDESCRES
export const RESETRESET//reduces:import {Action} from ngrx/store
import {INSCRES,DESCRES,RESET} from ./actionsconst initalState0;
export function counterReducer(state:numberinitalState,action:Action){switch(action.type){case INSCRES:return state1;case DESCRES:return state-1case RESET:return 0default:return state}}
(4) 页面中注入注意angular中使用store和react稍有不同。没有createStorereducer然后根组件注入的过程而是在具体页面里直接注入到constructor中我们以news页面为例 import { Component, ElementRef, ViewChild } from angular/core;
import {INSCRES,DESCRES,RESET} from ../../store/reducer
import {Store,select} from ngrx/store
import { Observable } from rxjs;interface AppState{count:number
}Component({selector: app-news,templateUrl: ./news.component.html,styleUrls: [./news.component.less]
})export class NewsComponent {count:Observablenumberconstructor(public http:HttpClient,private store:StoreAppState){let streamstore.pipe(select(count))stream.subscribe(res{console.log(res:,res)})this.countstore.pipe(select(count))}increasement(){this.store.dispatch({type:INSCRES})}decreasement(){this.store.dispatch({type:DESCRES})}reset(){this.store.dispatch({type:RESET})}}然后在具体的页面中使用count button (click)increasement()增加increase/buttondivcounter {{count | async }}/divbutton (click)decreasement()减少increase/buttonbutton (click)reset()reset counter/button
整体来看和react中使用redux并没有太大的差异。唯一的差异就是在react中需要定义storelet storecreateStore(state,)angular中直接通过在页面中注入的方式完成。 二actions也可以是函数我们可以改造下actions
//actions :注意这里需要用Injectable
import {Injectable} from angular/coreexport const INSCRESINSCRES
export const DESCRESDESCRES
export const RESETRESETInjectable()
export class CountAction{add(){return {type:INSCRES}}}
此时我们需要向app.moudule.ts中作相应修改
import { NgModule } from angular/core;
import { BrowserModule } from angular/platform-browser;import {CountAction} from ./store/actionsimport { AppComponent } from ./app.component;
import { NZ_I18N } from ng-zorro-antd/i18n;
import { zh_CN } from ng-zorro-antd/i18n;import { HomeComponent } from ./pages/home/home.component;
import { AppRouteModule } from ./app-route.module;import { StoreModule } from ngrx/store;registerLocaleData(zh);NgModule({declarations: [AppComponent,LayoutComponent,HomeComponent,],providers: [{provide:CountAction},{ provide: [NZ_I18N, UrlSerializer], useValue: zh_CN },{ provide: HTTP_INTERCEPTORS, useClass: AuthInterceptorInterceptor, multi: true },],bootstrap: [AppComponent],imports: [BrowserModule,FormsModule,AppRouteModule,StoreModule.forRoot({count:counterReducer}, {}),]
})
export class AppModule { }注意这里我们给providers添加了counterAction以便在所有页面都可以注入countActions
回到页面本身
import { Component, OnInit } from angular/core;
import { Observable, Observer } from rxjs;
import{CountAction} from ../../store/actions
import {Store,select} from ngrx/storeinterface AppState{count:number
}Component({selector: app-home,templateUrl: ./home.component.html,styleUrls: [./home.component.less]
})
export class HomeComponent {count:Observablenumberconstructor(private store:StoreAppState,private action:CountAction){this.countthis.store.pipe(select(count))increasement(){this.store.dispatch(this.action.add())}}这里逻辑的实现和之前一致唯一的区别就是我们countAction直接注到了counstor里然后在具体的执行函数中直接actiions的方法。
