home.js

let as = document.getElementsByTagName('a')
let now = Date.now();
for (let item of as) {
  let href = item.getAttribute('href');
  let last = localStorage.getItem(href);
  let days_ago = (now - last)/1000/60/60/24;
  let h = 190;
  // if (days_ago > 20) { h = 90; }
  let s = days_ago > 1 ? 20 : 20 + 60 * (1 - days_ago);
  let l = days_ago > 1 ? 20 : 20 + 60 * (1 - days_ago);
  item.style.backgroundColor = `hsl(${h},${s}%,${l}%)`
  if (days_ago < 1) {
    item.style.color = `black`
  }
  item.addEventListener("click",  function() {
    localStorage.setItem(href,Date.now());
  } );
  console.log(` added ${href} (${days_ago})`);
}