我怎样才能从对象中删除一个键，除非键名在你执行删除之前是不知道的？

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

// 假设我们要删除的键名存储在变量 unknownKey 中
let unknownKey = 'key2';

for (let key in obj) {
  if (key === unknownKey) {
    delete obj[key];
    break; // 删除后退出循环
  }
}

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

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

// 假设我们要删除的键名存储在变量 unknownKey 中
let unknownKey = 'key2';

if (Object.keys(obj).includes(unknownKey)) {
  delete obj[unknownKey];
}

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