for .in 语法不支持？

Question

如题：for .in 语法不支持？

Answer 1

copyRecord(source: Record<string, string>): Record<string, string> {
  const target: Record<string, string> = {};
  // 遍历源对象的属性
  let sourceKeys = Object.keys(source)
  let targetKeys = Object.keys(target)
  for (let i = 0;i<sourceKeys.length;i++) {
    if (targetKeys.indexOf(sourceKeys[i])>=0) {
      // 复制到目标对象
      target[sourceKeys[i]] = source[sourceKeys[i]];
    }
  }
  return target;
}