我对使用三元感到困惑

Question

所以我只是想用此代码计算平均成绩。我不确定，我不确定为什么。

   const finalGrade = (num1,num2,num3) =>{
  let sum = num1 + num2 + num3;
  let grade = sum / 3;

  grade < 59 ? 'F': 
  grade < 69 ? 'D': 
  grade < 79 ? 'C': 
  grade < 89 ? 'B': 
  grade < 100 ?'A': console.log('Error!');


}

Answer 1

尝试使用：

  const finalGrade = (num1,num2,num3) =>{
  let sum = num1 + num2 + num3;
  let grade = sum / 3;

  return grade < 59 ? 'F': 
         grade < 69 ? 'D': 
         grade < 79 ? 'C': 
         grade < 89 ? 'B': 
         grade < 100 ?'A': console.log('Error!');
}