<div class="emoji"> </div>
.emoji {
  width: 30px;
  height: 30px;
  background-image: url(http://img.cdn.sugarat.top/mdImg/MTU4NDE1NjM1Nzg2Mg==584156357862);
  background-size: 90px 90px;
  background-position: 0 0;
}
function rand() {
  return (~~(Math.random() * 100) % 3) * 30;
}
let $emoji = document.querySelector(".emoji");

function loop() {
  let x = rand();
  let y = rand();
  $emoji.style.backgroundPosition = `${x}px ${y}px`;
  // 500ms
  setTimeout(loop, 500);
}
loop();

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