react实现留言板功能

React组件：

import React from 'react';

class Board extends React.Component {
    constructor() {
        super();
        this.state = {
            comments: [
                {
                    auhor:"阿大",
                    time:new Date().getTime(),
                    comment:"good people"
                }
            ]
        }
        //修正事件指针
        this.addComment=this.addComment.bind(this);
    }

    addComment(){
        console.log(this.refs)
        console.log(this.render())
        //添加信息，set数据，实时渲染
        var comment={
            auhor:this.refs.author.value,
            time:new Date().getTime(),
            comment:this.refs.comment2.value
        }
        this.state.comments.push(comment);
        this.setState({
            comments:this.state.comments
        });
    }

    render() {
        //遍历结果
        let info =this.state.comments.map((item, index) => {
            return <div key={index}>
                <span>{item.auhor}</span><br/>
                <span>{item.time}</span><br/>
                <span>{item.comment}</span>
            </div>
        })
        return (
            <div>
                <h2>留言板</h2>
                <div className="comments">
                    {info}
                </div>
                <input type="text" ref="author"/><br/>
                <textarea ref="comment"></textarea><br/>
                <button onClick={this.addComment}>发表留言</button>
            </div>
        )
    }
}

export default Board;