react map遍历报错

Question

map遍历出错！！！

let val = ["111","222","333","444","555","666","777"];let Hear= React.createClass({        render: function() {          
                             return (                <article className="hear">
                    <div className="divst">
                        <ul> {
                            val.map(function(names){
                                return <li>{names}</li>
                            })
                        } </ul>
                    </div>
                </article>
            );
        }
});