--- tags: JS 直播班 - 2023 秋季班 --- # 🏅 Day 18 - 函式觀念三 依照下方程式碼練習，並回答問題。 ### 函式參數觀念 [課程影音連結](https://courses.hexschool.com/courses/2020111311/lectures/48764712)（函式參數介紹、參數寫法） 1. 函式可以帶入自定義的參數（在此為 num1, num2），並在呼叫函式的時候傳入。 ```javascript= function callNum(num1, num2){ let total = num1 + num2; console.log(total); } // num1 等於 1, num2 等於 2 callNum(1, 2); // num1 等於 2, num2 等於 4 callNum(2, 4); ``` 2. 參數只存活在大括號。 ```javascript= function callNum(num){ // 在此可以成功呼叫 num console.log(num); } callNum(1); // 函數外部不可以呼叫 num，這行會報錯 // UDrncaught ReferenceError: num is not defined console.log(num); ``` 問題 --- 1. 觀看以下程式碼，最後會印出什麼，以及變數 `sum` 最後的值 ```javascript= let sum = 1; function calcNum(x) { sum += x; console.log(x); } calcNum(3); ``` 2. 下方程式碼宣告了一個陣列（陣列內是[費波那契數列](https://zh.wikipedia.org/zh-tw/%E6%96%90%E6%B3%A2%E9%82%A3%E5%A5%91%E6%95%B0)），請完成下方程式碼（補上 `...` 的部分），讓 `calcNextNum()` 函式可以正常執行，並讓陣列中最後兩個數字相加後 push 到陣列中，最後 `fibonacciArr` 陣列值為 `[1, 1, 2, 3, 5, 8]` ```javascript= let fibonacciArr = [1, 1, 2, 3, 5]; let fibonacciArrLength = fibonacciArr.length; function calcNextNum(...) { ... } calcNextNum(fibonacciArr[fibonacciArrLength-1], fibonacciArr[fibonacciArrLength-2]); console.log(fibonacciArr); ``` ## 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） ![](https://i.imgur.com/vftL5i0.png) <!-- 解答： 1. 3, sum: 4 2. ```javascript= let fibonacciArr = [1, 1, 2, 3, 5]; let fibonacciArrLength = fibonacciArr.length; function calcNextNum(last, penultimate) { // 參數命名可以隨意自訂 fibonacciArr.push(last+penultimate); } calcNextNum(fibonacciArr[fibonacciArrLength-1], fibonacciArr[fibonacciArrLength-2]); console.log(fibonacciArr); ``` --> 回報區 --- | Discord | CodePen / 答案 | |:--------------------:|:--------------------------------------------------------------------------------:| |Moreene|[CodePen](https://codepen.io/Moreene/pen/KKJMmrQ)| |kuanju27|[CodePen](https://codepen.io/Eero-Chiao/pen/wvNWdLq)| |詹姆士|[CodePen](https://codepen.io/z111048/pen/QWYEgWm)| | 銀光菇 | 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