以数组传参 js

function modifyArray(arr) {
    arr.push(4); // 修改数组
}

let myArray = [1, 2, 3];
console.log("Before:", myArray); // 输出: Before: [1, 2, 3]

modifyArray(myArray);
console.log("After:", myArray); // 输出: After: [1, 2, 3, 4]

function modifyArrayWithoutChangingOriginal(arr) {
    let newArr = arr.slice(); // 创建数组副本
    newArr.push(4);
    return newArr;
}

let myArray = [1, 2, 3];
console.log("Before:", myArray); // 输出: Before: [1, 2, 3]

let modifiedArray = modifyArrayWithoutChangingOriginal(myArray);
console.log("After:", myArray); // 输出: After: [1, 2, 3]
console.log("Modified Array:", modifiedArray); // 输出: Modified Array: [1, 2, 3, 4]

function deepCopyArray(arr) {
    return JSON.parse(JSON.stringify(arr));
}

let myArray = [[1, 2], [3, 4]];
let copiedArray = deepCopyArray(myArray);

copiedArray[0].push(5);
console.log("Original Array:", myArray); // 输出: Original Array: [[1, 2], [3, 4]]
console.log("Copied Array:", copiedArray); // 输出: Copied Array: [[1, 2, 5], [3, 4]]