function demo() {
    return 1;
    console.log('我是SeriousLose');
    return 2;
}
console.log(demo()); // 1

function demo() {
    try {
      return 1;
    } catch (err) {
      console.log(err);
      return 2;
    } finally {
      return 3;
    }
}
console.log(demo()); // 3

function demo() {
    try {
      return 1;
    } catch (err) {
      console.log(err);
      return 2;
    } finally {
      try {
        return 3;
      } finally {
        return 4;
      }
    }
}
console.log(demo()); // 返回 4

// 获取调用栈信息

  function firstFunction() {
    secondFunction();
  }
  function secondFunction() {
    thridFunction();
  }
  function thridFunction() {
    console.log(new Error().stack);
  }

  firstFunction();

  //=> Error
  //  at thridFunction (<anonymous>:2:17)
  //  at secondFunction (<anonymous>:5:5)
  //  at firstFunction (<anonymous>:8:5)
  //  at <anonymous>:10:1