如何在react js中用另一个对象的数据填充对象

const obj1 = { name: 'John', age: 25 };
const obj2 = { ...obj1 };

console.log(obj2);

class MyComponent extends React.Component {
  state = {
    formData: {
      username: '',
      password: '',
    },
  };

  handleInputChange = (event) => {
    const { name, value } = event.target;
    this.setState((prevState) => ({
      formData: {
        ...prevState.formData,
        [name]: value,
      },
    }));
  };

  render() {
    const { username, password } = this.state.formData;

    return (
      <form>
        <input
          type="text"
          name="username"
          value={username}
          onChange={this.handleInputChange}
        />
        <input
          type="password"
          name="password"
          value={password}
          onChange={this.handleInputChange}
        />
      </form>
    );
  }
}