react state初始化问题

报错

Can't call setState on a component that is not yet mounted. This is a no-op, but it might indicate a bug in your application. Instead, assign to `this.state` directly or define a `state = {};` class property with the desired state in the *** component.

大致：

不能再一个组件尚未mounted时调用 setState() 方法，这是一个空操作，但是可能会导致bug，所以，直接给this.state 赋值，或者定义成state = {};

问题代码

import React from 'react';
import { Icon } from 'antd';

class ProjMain extends React.Component {
  constructor(props) {
    super(props);
    this.setState({
      docDetail: {}
    })
  }
  
  render() {
    return (
        <div id={Style.projIndex}>
         	<h1 style={{fontSize: 40}}>{this.state.docDetail))}</h1>
        </div>
    );
  }
}

export default ProjMain;

render() 方法中如果使用了 this.state.docDetail，会导致编译报错

error

仔细检查代码

constructor(props) {
    super(props);
    this.setState({
      docDetail: {}
    })
  }

constructor 里使用了 setState，改为直接赋值后正常