嗨嗨！我是Winnie溫尼～

前言

let rainbowColorNumber = 7
let rainbowColor = ["紅","橙","黃","綠","藍","靛","紫" ]

咦～第一行是之前介紹過的變數宣告，宣告彩虹的顏色數量等於７，那第二行這個有大括號的是什麼呢？就是今天要介紹的「陣列(Array)」哩！而為什麼會有陣列呢？陣列是用來將相同性質的資料集合起來。

陣列 Array

陣列的值要使用［］包覆！
let 變數名稱 = [值,值,...]
例：

let number = [1,6,8]
let rainbowColor = ["紅","橙","黃","綠","藍","靛","紫" ]

資料讀取

陣列的排序是從0開始！
變數名稱[索引值]
例：取出彩虹顏色中的綠色

let rainbowColor = ["紅","橙","黃","綠","藍","靛","紫" ]
                   // 0,   1,  2,   3,   4,   5,  6 
console.log(rainbowColor[3]) //綠

資料讀取，並賦予至新變數

let 新變數名稱 = 原變數名稱[索引值]
例：我喜歡的是彩虹顏色中的黃色

let rainbowColor = ["紅","橙","黃","綠","藍","靛","紫" ]
                   // 0,   1,  2,   3,   4,   5,  6 
let colorILike = rainbowColor[2];
console.log(colorILike) //黃

陣列長度

變數名稱.length
例：我想要知道rainbowColor的陣列中有幾種顏色

let rainbowColor = ["紅","橙","黃","綠","藍","靛","紫" ]
let colorNum = rainbowColor.length;
console.log(colorNum) //7

參考資料

Array
JavaScript Array (陣列)

新手上路，如文章有錯誤或需修正之處，懇請大家多多指教！
那麼，我們明天見囉～