---
tags: JS 直播班 - 2023 秋季班
---
# 🏅 Day 16 - 函式觀念一

依照下方教學練習，並回答問題。

### 基本函式寫法教學
[課程影音連結](https://courses.hexschool.com/courses/2020111311/lectures/48764709)

1. 宣告、命名函式

// 在此 morningAction 是自定義的名稱
function morningAction() {
  // 定義函式執行內容
  console.log("刷牙");
  console.log("洗臉");
} 

2. 呼叫函式

morningAction();
morningAction();

> 1. 函式撰寫完後，需要呼叫才會執行
> 2. 函式可以重複呼叫

問題
---
1. 宣告一個函式，讓此函式執行後會印出字串 `"這是一個函式"`
2. 觀看下方程式碼，最後會印出什麼

function sayHello() {
  console.log("ㄋ好");
}
console.log("Bye！");

3. 觀看下方程式碼，選出正確敘述

function sayHi() {
  console.log("Hi");
}
sayHi();
sayHi();

/* 選項 
   1. 函式不能重複呼叫，會報錯
   2. 最後會印出兩個 Hi
   3. 只會執行一次，印出一個 Hi
*/

## 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. 函式名稱可以隨意命名，盡量與執行內容相符即可

function printString() {
  console.log("這是一個函式");
}
printString();  // 記得呼叫才會執行

2. Bye！
3. 選項 2
-->

回報區
---

| Discord | CodePen / 答案 |
|:-------------:|:----------------------------------------------------------------------------:|
| pinyi_9 | [CodePen](https://codepen.io/Wpypy/pen/bGzpNqN) |
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