---
tags: JS 直播班 - 2023 秋季班
---
# 🏅 Day 09 - if、else if、else 練習一

### 題目

請看完此篇文章「[if else 陳述式](https://developer.mozilla.org/zh-TW/docs/Web/JavaScript/Guide/Control_flow_and_error_handling#if...else_%E9%99%B3%E8%BF%B0%E5%BC%8F)」部分，並試著回答下面問題。

問題
---

請試著寫出以下情境：

範例： 如果我有 100 元，我就吃壽司，沒有就吃超商。

let myWallet = 200;

if(myWallet >= 100) {
 console.log('我要吃壽司');
} else {
 console.log('我吃超商');
}

1. 如果下雨我就坐捷運上班，沒有我就騎車上班

let weather = '雨天';

/* 請試著寫出判斷式 */

2. 如果 BMI > 24 就超重，18 ~ 24 體重正常，小於 18 過輕。（提示：補上問號部分)

let myBMI = 19;

/* 請試著寫出判斷式 */

if( ??? ) {
  console.log('過重');
} else if( ??? ) {
  console.log('體重正常');
} else {
  console.log('過輕');
}
 

## 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.

let weather = '雨天';

if(weather === '雨天') {
 console.log('搭捷運上班');
} else {
 console.log('騎車上班');
}

2.

let myBMI = 19;

if(myBMI > 24) {
 console.log('過重');
} else if (myBMI <= 24 && myBMI >= 18){
 console.log('體重正常');
} else {
 console.log('過輕');
}

-->

回報區
---

| Discord | CodePen / 答案 |
|:-------------:|:------------------------------------------------------------------:|
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