const tracks = ["HTML", "CSS", "JavaScript"];

const user = {
  name: "林晨",
  stage: "基础阶段",
};

function sumScores(...scores) {
  return scores.reduce((total, score) => total + score, 0);
}

const newTracks = [...tracks, "ES6+"];
const nextUser = { ...user, stage: "现代 JS" };
const totalScore = sumScores(88, 91, 95);

document.getElementById("output").textContent = JSON.stringify(
  {
    newTracks,
    nextUser,
    totalScore,
  },
  null,
  2
);