Dmitriy Mozgovoy

function loadScript(src,_timeout) {

           return new Promise(function(resolve, reject){
               if(!src){
                   reject(new TypeError("filename is missing"));
                   return;
               }

               var script=document.createElement("script"),
                   timer,
                   head=document.getElementsByTagName("head")[0];


               head.appendChild(script);

               function leanup(){
                   clearTimeout(timer);
                   timer=null;
                   script.onerror=script.onreadystatechange=script.onload=null;
               }

               function onload(){
                   leanup();
                   if(!script.onreadystatechange||(script.readyState&&script.readyState=="complete")){
                       resolve(script);
                   }
               }

               script.onerror=function(error){
                   leanup();
                   head.removeChild(script);
                   script=null;
                   reject(new Error("network"));
               };

               if (script.onreadystatechange === undefined) {
                   script.onload = onload;
               } else {
                   script.onreadystatechange = onload;
               }

               timer=setTimeout(script.onerror,_timeout||30000);
               script.setAttribute("type", "text/javascript");
               script.setAttribute("src", src);
           });
       }

       function loadCSS(src, _timeout) {
           var css = document.createElement('link'), c = 1000;
           document.getElementsByTagName('head')[0].appendChild(css);
           css.setAttribute("rel", "stylesheet");
           css.setAttribute("type", "text/css");


           return new Promise(function(resolve, reject){
               var c=(_timeout||10)*100;
               if(src) {
                   css.onerror = function (error) {
                       if(timer)clearInterval(timer);
                       timer = null;

                       reject(new Error("network"));
                   };

                   var sheet, cssRules, timer;
                   if ('sheet' in css) {
                       sheet = 'sheet';
                       cssRules = 'cssRules';
                   }
                   else {
                       sheet = 'styleSheet';
                       cssRules = 'rules';
                   }
                   timer = setInterval(function(){
                       try {
                           if (css[sheet] && css[sheet][cssRules].length) {
                               clearInterval(timer);
                               timer = null;
                               resolve(css);
                               return;
                           }
                       }catch(e){}

                       if(c--<0){
                           clearInterval(timer);
                           timer = null;
                           reject(new Error("timeout"));
                       }
                   }, 10);

                   css.setAttribute("href", src);
               }else{
                   reject(new TypeError("filename is missing"));
               }
           });
       }

loadScript("/engine/classes/js/jquery.pickmeup.min.js").then(function(){
           console.log("js ready");
       },function(error){
           console.log(error);
       })

       loadCSS("/engine/classes/css/pickmeup.min.css").then(function(){
           console.log("css ready");
       },function(error){
           console.log(error);
       })

function decodePath(url){

           var parts=(url+"").split("?",2),
               path=(parts[0]+'').split("/"),
               query=(parts[1]+'').split("&"),
               params={};

               query.forEach(function(value){
                   var group=value.split("=");
                   params[group[0]]=group[1];
               });

           return {
               path:path,
               params:params
           };
       }

       console.log(decodePath("param1/param2/?name1=value1&name2=value2"));

/*
Вернет	
params:	Object { name1="value1",  name2="value2"}
path :  ["param1", "param2", ""]
*/

<select onchange="updatePrice(this)">
    <option data-price='10000'>Angelina Jolie</option>
    <option data-price='20000'>Jessica Alba</option>
    <option data-price='30000'>Mila Kunis</option>
</select>

function updatePrice(select){
                 var selected=select.options[select.selectedIndex],
                     price=selected.getAttribute("data-price");

                 confirm("Order "+select.value+" for "+price+"$ per hour?");
            }

xmlhttp = new XMLHttpRequest();
xmlhttp.open('GET', '/xhr/test.html', true);
xmlhttp.onreadystatechange = function() {
  if (xmlhttp.readyState == 4&&xmlhttp.status == 200) {
       alert(xmlhttp.responseText);
  }
};
xmlhttp.send(null);

function parseURL(url) {
                 var a = document.createElement("a");
                 a.href = url;
                 return a.search;
             }
alert(parseURL("https://yandex.kz/images/?redircnt=1432190913"));  // выдаст   ?redircnt=1432190913

element.className=["class1","sdsd","ololo","pfff","uxaxa"][index];

var name="admin"
    
    setTimeout(function(){
        alert(name);
    },1000);

function sayAfter(text,delay){  
    setTimeout(function(){
        alert(text);
    },delay);
   }

  sayAfter("lol",1000);

(function(){
        var x, y, z;

        //много разного кода, много переменных, которые не нужны в глобальной области видимости
    })();

<a href="/feed" data-virtual>Feed</a>
        <a href="/news" data-virtual>News</a>
        <a href="/users" data-virtual>Users</a>
        <a href="/users">Real link</a>

document.body.addEventListener("click",function(evt){
                var target=evt.target;
                if(target.tagName=="A"){
                    if(target.hasAttribute("data-virtual")){
                        window.history.pushState({},target.textContent,target.href);
                        evt.preventDefault();
                        alert("Идем на "+target.href);
                    }
                }
            })

            window.addEventListener("popstate",function(evt){
                alert("Назад на "+window.location.href);
            })