## 數組操作 * 創建數組 ~~~ let strArr = ["Alice", "Bob", "Cindy"]; let numArr = [1, 3, 5, 7, 9]; console.log(strArr); console.log(numArr); ~~~ * 訪問和修改數組元素 ~~~ let strArr = ["Alice", "Bob", "Cindy"]; strArr[0] = "Dog"; // 將Alice修改為Dog console.log(strArr); ~~~ * 獲取數組長度 ~~~ let strArr = ["Alice", "Bob", "Cindy"]; console.log(strArr.length); ~~~ * 遍歷數組 ~~~ let strArr = ["Alice", "Bob", "Cindy"]; for (let i=0; i < strArr.length; i++) { console.log(strArr[i]); } ~~~ * 字符串轉換數組 ~~~ let userName = "Alice, Bob, Cindy, Dog"; let strToArr = userName.split(","); console.log(strToArr); console.log(strToArr[0]); ~~~ * 數組轉換字符串 ~~~ let arr = ["Alice", "Bob", "Cindy", "Dog"]; let arrToStr = arr.join(","); console.log(arrToStr); ~~~ * 添加和刪除元素 ~~~ let arr = ["Alice", "Bob", "Cindy", "Dog"]; arr.push("Eddie"); // 在結尾添加 arr.unshift("Eddie");// 在開頭添加 console.log(arr); arr.pop(); // 在結尾刪除 arr.shift(); // 在開頭刪除 console.log(arr); ~~~