日本製BaaSであるappiaries（アピアリーズ）のAPIを利用するためのJavaScriptライブラリ appiary.1.0.1.jsの使用を前提としたスニペット。ユーザー認証機能使用。

appiary_sign_1_0_1.js

document.addEventListener("DOMContentLoaded",function(){
 var appiary      = new Appiary('_sandbox','message','app3b76cc6ba7fbc88e521e0ed4ec','d3d5b7704c0cd02','nickname');
 appiary.nickname = '';
 var articles  = document.querySelector('#articles');
 var login      = document.querySelector('#login');
 var message    = document.querySelector('#message');
 if(appiary.store_token){
    post_mes.style.display = 'block';
    message.style.display = 'none';
 }else{
    login.setAttribute('href',appiary.oauth_url+'&redirect_uri='+location.href);
    post_mes.style.display = 'none';
    message.style.display  = 'block';
 }
 var col  = appiary.collection('sign');
 col.callback = function(e){
  var res  = JSON.parse(e.target.responseText);
  var objs = res._objs;
  objs.reverse();
  articles.innerHTML='';
  for(var i=0;i<objs.length;i++){
      var art   = Appiary.create('article',{},articles);
      var text  = Appiary.create('div',{class:'text'},art);
      Appiary.create('text',objs[i]['text'],text);
      var prop  = Appiary.create('div',{class:'prop'},art);
      var user  = Appiary.create('span',{class:'user'},prop);
      Appiary.create('text',objs[i]['nickname']||objs[i]['_uby'],user);
      var date  = Appiary.create('span',{class:'date'},prop);
      var uts   = new Date(objs[i]['_uts']);
      Appiary.create('text',uts.toLocaleString(),date);
  }
 }

 col.error = function(e){
   articles.innerHTML=e.toString();
 }

 col.render = function(){
   col.x({path:'-',onload:col.callback,onerror:col.error});
 }
 col.post=function(){
  var text = document.querySelector('#mes_input').value;
  var data = {'text':text, 'nickname':appiary.nickname||'anonymous'};
  col.x({method:'POST',data:data,onload:col.render,onerror:col.error});
 } 
 document.querySelector('#mes_button').addEventListener('click',col.post,false);
 col.render();

 if(appiary.user_token){
    appiary.show_nickname=function(e){
getAllResponseHeaders());
     if(typeof e.target.responseText=='string'){
        var res = JSON.parse(e.target.responseText);
        console.log('[nickname]'+res.nickname)
        appiary.nickname = res.nickname;
        login.innerHTML  = res.nickname;
     }else{
        console.log('[show_nickname.responseText] '+e.target.responseText);
     }
    }
    appiary.getUser({'onload':appiary.show_nickname});
 }
},false);