js list传递

function modifyList(list) {
    list.push('new item'); // 修改传入的数组
}

let myList = ['item1', 'item2'];
console.log(myList); // 输出: ['item1', 'item2']

modifyList(myList);
console.log(myList); // 输出: ['item1', 'item2', 'new item']，注意数组已被修改

function modifyListCopy(list) {
    let copy = [...list]; // 创建数组的副本
    copy.push('new item');
    return copy;
}

let myList = ['item1', 'item2'];
console.log(myList); // 输出: ['item1', 'item2']

let modifiedList = modifyListCopy(myList);
console.log(modifiedList); // 输出: ['item1', 'item2', 'new item']，但原始数组未被修改
console.log(myList); // 仍然输出: ['item1', 'item2']