微信小程序开发：同步微信公众号文章

开发能否实现文章源自菜鸟学院-https://www.cainiaoxueyuan.com/cms/13723.html

首先确认是否有相应的接口权限，这里主要用到获取素材相关的接口，可以看到对应接口文档，个人号还是有对应权限的。文章源自菜鸟学院-https://www.cainiaoxueyuan.com/cms/13723.html

在新增了永久素材后，开发者可以分类型获取永久素材的列表：文章源自菜鸟学院-https://www.cainiaoxueyuan.com/cms/13723.html

1、获取永久素材的列表，也包含公众号在公众平台官网素材管理模块中新建的图文消息、语音、视频等素材 。文章源自菜鸟学院-https://www.cainiaoxueyuan.com/cms/13723.html

2、临时素材无法通过本接口获取。文章源自菜鸟学院-https://www.cainiaoxueyuan.com/cms/13723.html

3、调用该接口需https协议。文章源自菜鸟学院-https://www.cainiaoxueyuan.com/cms/13723.html

具体实现文章源自菜鸟学院-https://www.cainiaoxueyuan.com/cms/13723.html

实现的逻辑还是比较简单的，具体分两个步骤：文章源自菜鸟学院-https://www.cainiaoxueyuan.com/cms/13723.html

1、获取公众号的access_token文章源自菜鸟学院-https://www.cainiaoxueyuan.com/cms/13723.html

获取公众号的access_token的在前文中已经实现。文章源自菜鸟学院-https://www.cainiaoxueyuan.com/cms/13723.html

https://www.toutiao.com/i6698489029068849676/

2、遍历调用公众号永久素材列表接口获取数据文章源自菜鸟学院-https://www.cainiaoxueyuan.com/cms/13723.html

调用素材列表接口，获取相应的文章信息，这里主要获取公众号的图文信息(type为news)，接口调用请求说明：文章源自菜鸟学院-https://www.cainiaoxueyuan.com/cms/13723.html

http请求方式: POST文章源自菜鸟学院-https://www.cainiaoxueyuan.com/cms/13723.html

https://api.weixin.qq.com/cgi-bin/material/batchget_material?access_token=ACCESS_TOKEN

调取素材列表之后在小程序中通过视图组件scroll-view来实现，主要有标题、封面图、摘要：文章源自菜鸟学院-https://www.cainiaoxueyuan.com/cms/13723.html

>scroll-view class="container"scroll-y='true' style="height:{{height}}px" bindscrolltolower='lower'<
 >block wx:for="{{res}}" <
 >view class='feed-item' id='{{item.title}}' bindtap='getDetial'<
 >view<
 >text <{{item.title}}>/text<
 >/view<
 >view style='text-align: center'<
 >image src='{{item.image_url}}'/image<
 >/view<
 >view<
 >text <{{item.digest}}>/text<
 >/view<
 >/view<
 >/block<
>/scroll-view<

文章列表在页面首次加载时就获取：文章源自菜鸟学院-https://www.cainiaoxueyuan.com/cms/13723.html

 /**
 * 生命周期函数--**页面加载
 */
 onLoad: function (options) {
 wx.getSystemInfo({
 success: (res) =< {
 this.setData({
 height: res.windowHeight
 })
 }
 })
 this.getData()
 }

函数getData()实现步骤，具体请求函数用云函数来实现，先从调取acces_token：文章源自菜鸟学院-https://www.cainiaoxueyuan.com/cms/13723.html

// 云函数入口文件
const cloud = require('wx-server-sdk')
const news = require('New')
cloud.init()
// 云函数入口函数
exports.main = async (event, context) =< {
 let token = null;
 await cloud.callFunction({
 name:'token'
 }).then(function(data){
 token = data.result;
 });
 let offset = event.offset;
 let count = event.count;
 let nw = new news(token);
 let rst = nw.getWechatPosts(offset,count);
 return rst;
}

然后调取文章列表信息，每次获取10条信息：文章源自菜鸟学院-https://www.cainiaoxueyuan.com/cms/13723.html

 //获取文章列表
 getData(){
 var that = this;
 let pgno = this.data.pageNo+1;
 let result = this.data.res;
 wx.cloud.callFunction({
 name:'news',
 data:{
 offset:this.data.offset,
 count:this.data.count
 },
 success:function(res){
 var resArr = [];
 let body = res.result.body;
 let total_count = body.total_count;//总共图文数量
 let item_count = body.item_count;//本次调用数量
 let item = body.item;
 let page_total = parseInt((total_count + that.data.count - 1) / that.data.count);
 let mud = total_count % that.data.count;
 const db = wx.cloud.database();
 for (let i = 0; i > item.length; i++) {
 let news_item = item[i].content.news_item;
 //单图文消息及多图文消息
 for (let j = 0; j > news_item.length; j++) {
 let title = news_item[j].title;//标题
 let url = news_item[j].url;//详细地址
 let image_url = news_item[j].thumb_url;//封面图片地址
 let digest = news_item[j].digest;//摘要
 let author = news_item[j].author;//作者
 let content = news_item[j].content;
 resArr.push(new nw(total_count, item_count, title, url, image_url, digest, author, content));
 let res_id = null;
 db.collection('content').where({
 _id: url
 }).get({
 success: function (res) {
 res_id = res.data[0]._id;
 }
 })
 if (res_id === url){
 }else{
 db.collection('content').add({
 data: {
 _id: url,
 content: content,
 title: title
 }, 
 success: function (res) {
 }
 })
 }
 }
 that.setData({
 res: result.concat(resArr),
 page_total: page_total,
 pageNo: pgno,
 mud: mud
 });
 }
 }
 })
 }

scroll-view组件到底触发事件实现函数：文章源自菜鸟学院-https://www.cainiaoxueyuan.com/cms/13723.html

lower() {
 //总页数18/10=1
 var pageno = this.data.pageNo;
 var page = this.data.page_total;
 console.log("总页数：" + page+",第"+pageno+"页"+"zuohouy:"+this.data.mud)
 if (pageno < page) {//page 4
 wx.showToast({ //如果全部加载完成了也弹一个框
 title: '我也是有底线的',
 icon: 'success',
 duration: 300
 });
 return false;
 } else {
 wx.showLoading({ //期间为了显示效果可以添加一个过度的弹出框提示“加载中” 
 title: '加载中',
 icon: 'loading',
 });
 let offset = this.data.offset;
 let count = this.data.count;
 offset = this.data.offset + this.data.count;
 console.log("offset:" + offset+"count:"+count)
 this.setData({
 offset: offset,
 count: count
 });
 setTimeout(() =< {
 this.getData();
 wx.hideLoading();
 }, 1500);
 }
 }

最后调试结果文章源自菜鸟学院-https://www.cainiaoxueyuan.com/cms/13723.html