双大括号在 React JSX 语法中的用途

javascript
import React from 'react';
class MyComponent extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      count: 0
    };
  }
  render() {
    return (
      
        
计数器: {this.state.count}
         this.setState({ count: this.state.count + 1 })}>
          增加
        
         this.setState({ count: this.state.count - 1 })}>
          减少
        
        
当前时间：{new Date().toLocaleTimeString()}
      
    );
  }
}
export default MyComponent;