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1、显示发布者的名字；2、增加新UI、3、关注其他学员的 canister IC入门课第五课作业：完善 Microblog 前端( 二 )

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Motoko：
import List "mo:base/List";import Iter "mo:base/Iter";import Principal "mo:base/Principal";import Time "mo:base/Time";import Nat "mo:base/Nat";actor {public type Message = {author: ?Text;text: Text;time: Time.Time;};public type User= {uid: Principal;uname: ?Text;};var king: Text = "Linnuo";public type Microblog = actor {follow: shared(Principal) -> async (); // add关注对象follows: shared query () -> async [User]; // return关注对象列表post: shared (Text) -> async (); // 发布新消息posts: shared (Time.Time) -> async [Message]; // return 发布消息列表posts2: shared (Text) -> async [Message]; // return 所有关注对象发布的消息timeline: shared (Time.Time) -> async [Message]; // return 所有关注对象发布的消息set_name: shared (Text) -> async ();// set 名字get_name: shared query () -> async ?Text; // get 名字unfollow: shared () -> async ();// 清空跟随};// stable 修饰：升级不清空内存stable var followed : List.List<User> = List.nil();public shared func follow(id: Principal) : async (){let canister : Microblog = actor(Principal.toText(id));let name: ?Text = await canister.get_name();let u = {uid = id;uname = name;};followed := List.push(u, followed);};public shared query func follows() : async [User] {List.toArray(followed);};stable var messages : List.List<Message> = List.nil();// （msg）：获取消息属性public shared (msg) func post(pwd: Text, text: Text) : async (){// 获取发送者: dfx identity get-principal// assert(Principal.toText(msg.caller) == "vw7ov-537vk-abslh-s2gx7-gw2ff-v4u6y-thlcs-hejxf-hkkc5-bjiq7-pqe"); //消息发送者assert(pwd == "qwe123");let m = {author = ?king;text = text;time = Time.now();};messages := List.push(m, messages);// 用钱包调用正常返回失败：dfx canister --wallet=$(dfx identity get-wallet) call microblog_backend post "(\"Second post\")"};public shared func posts(since: Time.Time) : async [Message] {var list : List.List<Message> = List.nil();for (m in Iter.fromList(messages)) {if (m.time >= since){list := List.push(m, list);}};List.toArray(list);};public shared func posts2(pid: Principal, since: Time.Time) : async [Message] {try {let canister : Microblog = actor(Principal.toText(pid));await canister.posts(since);} catch (err) {[]}};public shared func timeline(since: Time.Time) : async [Message] {var all : List.List<Message> = List.nil();for (user in Iter.fromList(followed)){let canister : Microblog = actor(Principal.toText(user.uid));let msgs = await canister.posts(since);for(msg in Iter.fromArray(msgs)){all := List.push(msg, all);};};List.toArray(all);};public shared func set_name(name: Text) {king := name;};public shared query func get_name() : async ?Text {return ?king;};public shared func unfollow() : async (){followed := List.nil();};// 发送消息：id和名称可以呼唤//dfx canister call rrkah-fqaaa-aaaaa-aaaaq-cai post "(\"First post\")"// 用Id发消息//dfx canister call microblog_backend post "(\"Second post\")"// 用名称发消息//dfx canister call rrkah-fqaaa-aaaaa-aaaaq-cai posts "()"// 获取消息列表//dfx canister call microblog_backend2 follow "(principal \"$(dfx canister id microblog_backend)\")"// 添加关注对象//dfx canister call microblog_backend2 follows "()"// 获取关注对象列表//dfx canister call microblog_backend2 timeline"()"// 获取所有关注对象发布的消息};代码的实现并不复杂，欢迎童鞋们指导哈
【1、显示发布者的名字；2、增加新UI、3、关注其他学员的 canister IC入门课第五课作业：完善 Microblog 前端】为了避免直接下载项目，这里就不贴 Github 入口了，好好学习 ， 加油

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