React获取组件实例
1. 直接new Component()
组件本身也是class,可以new,这样的组件实例意义不大
componentInstance = new Component();
2. ReactDOM.render返回组件实例(React新版本已失效,返回null)
componentInstance = ReactDOM.render(<Component />, div);
3. ref回调函数返回组件实例(React新版本可用)
let componentInstance; ReactDOM.render(<Component ref={(com) => componentInstance = com} />,div>)