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index/src/app/view/admin/services/article/article.service.ts

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+import {Injectable} from '@angular/core';
+import {HttpService} from '../http.service';
+import {PageList} from "../../../../class/HttpReqAndResp";
+import {Article} from "../../../../class/Article";
+import {exist} from "../../../../utils/dataUtil";
+
+@Injectable({
+    providedIn: 'root'
+})
+export class ArticleService {
+
+
+    constructor(public http: HttpService) {
+    }
+
+    // 存储所有已经请求过的数据<首页数据>
+    pageList: PageList<Article>[] = [];
+
+    currentPage: PageList<Article>;
+
+    /**
+     * 获取文章
+     * @param pageNum 页码数
+     * @param pageSize 单页数据量
+     */
+    getArticle(pageNum: number, pageSize: number) {
+        const articlePage = exist<Article>(pageNum, pageSize, this.pageList);
+        if (articlePage) {
+            articlePage.subscribe(data => {
+                this.currentPage = data;
+            });
+            return articlePage;
+        }
+        const observable = this.http.get('/admin/articles?page=' + pageNum + '&count=' + pageSize);
+        observable.subscribe(data => {
+            if (data.code === 0) {
+                this.currentPage = data.result;
+                this.pageList.push(data.result);
+            }
+        });
+        return observable;
+    }
+
+    deleteArticle(id) {
+        return this.http.delete('/admin/article/del?articleID=' + id);
+    }
+
+}