basilalex

// Ставит запятые в числах
function numberWithCommas(x) {
    return x.toString().replace(/\B(?=(\d{3})+(?!\d))/g, ',');
}

basilalex

function checkEmail(email) {
  const reg = /^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4})$/;
  (!reg.test(email)) ? return false : return true;
}

basilalex

<picture>
  <source
  	media="(min-width: 1024px)"
  	srcset="opera-fullshot-1x.jpg 1x,
  			opera-fullshot-2x.jpg 2x,
  			opera-fullshot-3x.jpg 3x">
  <img
  	src="opera-closeup-1x.jpg" alt="The Oslo Opera House"
  	srcset="opera-closeup-2x.jpg 2x,
  			opera-closeup-3x.jpg 3x">

basilalex

<input 
    type="tel"
    name="phone"
    placeholder="Телефон"
    pattern="[\+]\d{2}\s[\(]\d{3}[\)]\s\d{3}[\-]\d{2}[\-]\d{2}"
    minlength="13"
    maxlength="13"
/>

basilalex

let lastScrollTop = 0;

function scrollDirection() {
    const st = window.pageYOffset || document.documentElement.scrollTop;

    if (st > lastScrollTop) {
        // downscroll code
    } else {
        // upscroll code
    }

basilalex

export default arr => new Promise((resolve) => {
    const imgs = [];
    arr.forEach((path) => {
        const img = new Image();
        img.onload = () => {
            imgs.push(img);
            if (imgs.length === arr.length) resolve(imgs);
        };
        img.src = `../img/phone/phone_000${path}`;
    });