如何通过函数参数传递数组- javascript

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); // 修改副本
  return newArr;
}

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