如何避免在Math.random()中出现两个连续的相同数字

let lastRandom = Math.random();
let currentRandom = Math.random();
while (currentRandom === lastRandom) {
  currentRandom = Math.random();
}
lastRandom = currentRandom;

function getRandom() {
  const timestamp = new Date().getTime();
  const random = Math.sin(timestamp).toString().substr(6);
  return parseFloat(`0.${random}`);
}