js删除object指定元素

let obj = {
  key1: 'value1',
  key2: 'value2',
  key3: 'value3'
};

// 删除 key2 属性
delete obj.key2;

console.log(obj); // 输出: { key1: 'value1', key3: 'value3' }

let obj = {
  key1: 'value1',
  key2: 'value2',
  key3: 'value3'
};

// 使用 Object.assign()
let newObj = Object.assign({}, obj);
delete newObj.key2;

console.log(newObj); // 输出: { key1: 'value1', key3: 'value3' }

// 使用展开运算符
newObj = { ...obj, key2: undefined };

console.log(newObj); // 输出: { key1: 'value1', key2: undefined, key3: 'value3' }
// 注意：这里 key2 并没有被删除，只是其值为 undefined

let obj = {
  key1: 'value1',
  key2: 'value2',
  key3: 'value3'
};

let keyToRemove = 'key2';
let newObj = Object.keys(obj).reduce((acc, key) => {
  if (key !== keyToRemove) acc[key] = obj[key];
  return acc;
}, {});

console.log(newObj); // 输出: { key1: 'value1', key3: 'value3' }