const score = 86;

let passed = score >= 60;
let grade = "";

if (score >= 90) {
  grade = "A";
} else if (score >= 80) {
  grade = "B";
} else if (score >= 60) {
  grade = "C";
} else {
  grade = "D";
}

console.log("分数：", score);
console.log("是否及格：", passed);
console.log("等级：", grade);