js怎么获取map的key

// 创建一个Map实例
const myMap = new Map();

// 设置键值对
myMap.set('key1', 'value1');
myMap.set('key2', 'value2');
myMap.set('key3', 'value3');

// 获取Map中的所有键
const keys = myMap.keys();

// 将迭代器转换为数组（如果需要）
const keysArray = Array.from(myMap.keys());

console.log(keys); // MapIterator { 'key1', 'key2', 'key3' }
console.log(keysArray); // ['key1', 'key2', 'key3']

for (const key of myMap.keys()) {
  console.log(key);
}

for (const [key, value] of myMap) {
  console.log(key, value);
}