内存服务器
angular提供了一个快速建立测试用的web服务方法,内存服务器(in-memory),让我们不用等待后端开发的进度
安装npm包
npm install --save angular-in-memory-web-api
构建数据模型
在todo文件夹创建文件todo-data.ts
import { InMemoryDbService } from "angular-in-memory-web-api"; import { Todo } from "./todo.model"; export class InMemoryTodoDbService implements InMemoryDbService{ createDb(){ let todos:Todo[]=[ {id:'c24743b1-942e-0527-4810-fa1175b92d90',desc:'hello world',completed:false}, {id:'c24743b1-942e-0527-4810-fa1175b92d91',desc:'hello',completed:false}, {id:'c24743b1-942e-0527-4810-fa1175b92d92',desc:'hello',completed:false}, {id:'c24743b1-942e-0527-4810-fa1175b92d93',desc:' world',completed:false}, {id:'c24743b1-942e-0527-4810-fa1175b92d94',desc:' world',completed:false}, {id:'c24743b1-942e-0527-4810-fa1175b92d95',desc:'hello world',completed:false}, {id:'c24743b1-942e-0527-4810-fa1175b92d96',desc:'hello world',completed:false}, ]; return {todos}; } }
我们创建了一个InMemoryDbService的内存数据库
内存web服务
首先在app.module.ts加入类引用
调用“假的web服务”
修改todo.service.ts
import { Injectable } from '@angular/core'; import { Todo } from "./todo.model"; import { UUID } from "angular2-uuid"; import { Http,Headers } from "@angular/http"; import 'rxjs/add/operator/toPromise'; @Injectable() export class TodoService { //定义web api地址和headers private api_url='api/todos'; private headers=new Headers({'Content-Type':'application/json'}); //post /todo addTodo(desc:string):Promise<Todo>{ let todo={ id:UUID.UUID(), desc:desc, completed:false }; return this.http .post(this.api_url,JSON.stringify(todo),{headers:this.headers}) .toPromise() .then(res=>res.json().data as Todo) .catch(this.handleError); } //error处理 private handleError(error:any):Promise<any>{ console.log('an error occurred:',error); return Promise.reject(error.message||error); } todos:Todo[]=[]; constructor(private http:Http) { } }