kocherman

for (let i = 0; i < 11; i++) { 
  console.log(10-i); 
  console.log(i);
}

if('krd.site.ru' == location.hostname){
  document.querySelector('#address').innerHTML="Мой адрес не дом и не улица";
}
else if('spb.site.ru' == location.hostname){
  document.querySelector('#address').innerHTML="WWW.LENINGRAD.SPB.RU";
}

function eventFire(el, etype){
  if (el.fireEvent) {
    el.fireEvent('on' + etype);
  } else {
    var evObj = document.createEvent('Events');
    evObj.initEvent(etype, true, false);
    el.dispatchEvent(evObj);
  }
}

eventFire(document.querySelector('.EtoKnopka'), 'click');

document.querySelector() 
document.querySelectorAll()

document.getElementsByClassName()
document.getElementById() 
document.getElementsByTagName()

let dotContainer = document.querySelector('.slide_dots');
let dotList = [... this.slides].map(slide => {
  const dot = document.createElement('div');
  dot.classList.add('dot');
  dotContainer.appendChild(dot);
  return dot;
});
console.log( dotList );   //  [ <div></div>, <div></div>, <div></div>, ... ]

function require(url,cb){
  let script = document.createElement('script');
  script.setAttribute('type','application/javascript');
  script.setAttribute('src',url);
  if('function' == typeof cb) 
    script.addEventListener('load', cb, false);
  document.head.appendChild(script);
  return script;
}

function isHidden(element){
  const elementRect = element.getBoundingClientRect();
  const elementHidesUp = elementRect.top < 0;
  const elementHidesLeft = elementRect.left < 0;
  const elementHidesDown = elementRect.bottom > window.innerHeight;
  const elementHidesRight = elementRect.right > window.innerWidth;
  const elementHides = elementHidesUp || elementHidesLeft || elementHidesDown || elementHidesRight;
  return elementHides;
}
function countHidden(element){
  const elementRect = element.getBoundingClientRect();
  const elementHides = { 
    up: Math.max(0,0 - elementRect.top),
    left: Math.max(0,0 - elementRect.left),
    down: Math.max(0,elementRect.bottom - window.innerHeight),
    right: Math.max(0,elementRect.right - window.innerWidth)
  };
  return elementHides;
}

window.addEventListener('DOMContentLoaded', function domLoadedHandler(e){
   /* твой js */
}, false);

let x;
function abc(num){
  return () => {
       return num**2;
   }
}
x = abc(4);
console.log(x()); // 16


(async ()=>{
   let x = await promisify($.getJSON)('./json.json');
  console.log( x ) // ...твоя data...
})();


// A simplified implementation of `util.promisify()`. Doesn't
// cover all cases, don't use this in prod!
function promisify(fn) {
  return function() {
    const args = Array.prototype.slice.call(arguments);
    return new Promise((resolve, reject) => {
      fn.apply(this, [].concat(args).concat([(err, res) => {
        if (err != null) {
          return reject(err);
        }
        resolve(res);
      }]));
    });
  };
}