如何确保单选按钮处于选中状态

<input type="radio" name="gender" value="male" checked> Male
<input type="radio" name="gender" value="female"> Female

document.getElementById("radioButton").checked = true;

class MyComponent extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      selectedOption: 'option1'
    };
  }

  handleOptionChange = (event) => {
    this.setState({
      selectedOption: event.target.value
    });
  }

  render() {
    return (
      <div>
        <label>
          <input
            type="radio"
            name="options"
            value="option1"
            checked={this.state.selectedOption === 'option1'}
            onChange={this.handleOptionChange}
          />
          Option 1
        </label>
        <label>
          <input
            type="radio"
            name="options"
            value="option2"
            checked={this.state.selectedOption === 'option2'}
            onChange={this.handleOptionChange}
          />
          Option 2
        </label>
      </div>
    );
  }
}

<div id="app">
  <input type="radio" id="option1" value="option1" v-model="selectedOption">
  <label for="option1">Option 1</label>
  <input type="radio" id="option2" value="option2" v-model="selectedOption">
  <label for="option2">Option 2</label>
</div>

new Vue({
  el: '#app',
  data: {
    selectedOption: 'option1'
  }
});