Angular Typescript无法从键值对中获取键值

const keyValuePairs = {key1: 'value1', key2: 'value2'};
const key = 'key1';

if (keyValuePairs.hasOwnProperty(key)) {
  const value = keyValuePairs[key];
  console.log(`The value for key ${key} is ${value}`);
} else {
  console.log(`Key ${key} does not exist`);
}

const keyValuePairs = {key1: 'value1', key2: 'value2'};
const key = 'key1';
const value = keyValuePairs[key] ?? 'Key does not exist';
console.log(`The value for key ${key} is ${value}`);