emptyJS | JavaScript 程式專案

{"id":21946,"student_id":283,"content":"var comments = [];//建立回答\r\nvar name = prompt('你的名字是什麼??') || '匿名';//建立名字,提問並回答,否則為匿名\r\nvar id = Math.floor(Math.random()*1000000);//建立ID為隨機0~1小數乘1000000後取整數\r\nvar users = {};//建立使用者\r\n\r\n//產生ID\r\nusers[id] = {//此段不了解，謝謝老師\r\n   id: id,\r\n   name: name,\r\n   time: Date.now()\r\n}\r\n\r\nforever(function(){//重覆執行\r\n\r\n   users[id].time = Date.now();//此行不了解，謝謝老師\r\n   DB.broadcast('update', users[id]);//廣播更新\r\n\r\n   for (var i=0; i\u003ccomments.length; i++) {//建立i , i小於回答長度就,秀出回答,i加1\r\n       print(comments[i], 150, 20*i + 10);\r\n   }\r\n\r\n   print('===在線使用者===');//秀出在線使用者\r\n   var i=0;\r\n   for (var num in users) {\r\n       i++;\r\n       print(users[num].name, 10, 10 + 20*i);\r\n       //移除離線超時玩家\r\n       if (Date.now() \u003e users[num].time + 1000) {\r\n           addMsg(users[num].name + '離開了聊天室');\r\n           delete users[num];\r\n       }\r\n   }\r\n});\r\n\r\nwhen('click', function () {//點擊時,提問你想說什麼,廣播訊息\r\n   var msg = name + '：' + prompt('你想說什麼?')\r\n   addMsg(msg);\r\n   DB.broadcast('message', msg);\r\n})\r\n//廣播\r\nDB.onMessage('update', function (data) {//此段不了解，謝謝老師\r\n   if (users[data.id] == undefined) {\r\n       addMsg(data.name + '加入了聊天室');\r\n   }\r\n   users[data.id] = data;\r\n});\r\n\r\nDB.onMessage('message', function (data) {//加入訊息資料\r\n   comments.unshift(data);\r\n});\r\n\r\nfunction addMsg (str) {//加入現在時間\r\n   comments.unshift('【' + (new Date).toLocaleTimeString() + '】' + str);\r\n}\r\n","created_at":"2018-02-10T09:54:46.500+08:00","updated_at":"2019-10-09T17:01:29.040+08:00","name":"emptyJS","language":"javascript","screenshot":{"url":"https://cdn1.koding.school/uploads/project/screenshot/21946/72617114e27de6909b6e7fee5fb9fcc1.jpg"},"parent_id":14981,"plugin":"","description":null,"note":null,"status":"public","like_student_ids":[],"is_featured":false,"views":118,"hashid":"yeysqrwv","is_content_changed":false,"review_status":"unsubmitted","submitted_at":null,"reviewed_at":null,"advise":null,"is_deleted":false}