---
tags: JS 直播班 - 2022 秋季班
---
# 🏅 Day 19 - 函式觀念四

依照下方程式碼練習，並回答問題。

### 函式的 return 觀念

[課程影音連結](https://courses.hexschool.com/courses/202011131/lectures/42391129)（return 寫法、return 可以有多個）

１. 函式可以用 return 回傳一個值，並可以將該值賦予給其他變數。

function calcTotalScore(chineseScore, englishScore){
  let total = chineseScore + englishScore;
  return total;
}

// 將 calcTotalScore 的回傳值賦值給 markScore。
let markScore = calcTotalScore(60, 50);
console.log(markScore);

2. return 會中斷函式執行，可以有多個 return、搭配 if else 做使用。

function calcTotalScore(chineseScore, englishScore){
  let total = chineseScore + englishScore;
    
  // 在此因為 total > 100，所以在第一個 if 函式就中斷了
  if(total > 100){
    return `總分 ${total}，做的好啊 mark`;
  else{
    return `總分 ${total}，考得不是很好 mark`;
  }

  // 以下的 return 都不會執行
  return chineseScore;
  return englishScore;
}

let markScore = calcTotalScore(60, 50);
console.log(markScore);

問題
---
1. 下方敘述何者正確
(1) 一個函式中不能有多個 return
(2) return 的值可以賦予到變數上，像是下方程式碼中變數 `midNum` 最後的值會變為 `2`

    let midNum = 0;
    function calcMidNum(num1,num2) {
      return (num1 + num2) / 2;
    }
    midNum = calcMidNum(1,3);

2. 觀看下方程式碼，選出正確敘述

let awardMoney = 0
function getAward(score) {
  if(score >= 90) {
    console.log("贏得獎金 100 元");
    return 100;
  } else if(score >= 60) {
    console.log("贏得獎金 50 元");
    return 50;
  } else {
    console.log("再接再厲！");
  }
  console.log("比賽結束！");
}
awardMoney = getAward(85);

選項：
(1) 最後會印出 2 個字串
(2) `awardMoney` 最後的值為 85
(3) `awardMoney` 最後的值為 50

## 回報流程

將答案寫在 CodePen 並複製 CodePen 連結貼至底下回報就算完成了喔!
解答位置請參考下圖（需打開程式碼的部分觀看）


<!-- 解答：

1. 2
2. 3
-->

回報區
---

| Discord | CodePen / 答案 |
|:--------------------:|:--------------------------------------------------------------------------------:|
| YC#2522 | [CodePen](https://codepen.io/YCLu/pen/ZERzXoQ) |
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