问题是您的语法无效，您应该具有以下内容：
var links = [
{ endpoint: '/america' },
{ endpoint: '/canada' },
{ endpoint: '/norway' },
{ endpoint: '/bahamas' }
];
class Navigation extends React.Component {
render() {
const listItems = links.map((link) =>
<li key={link.endpoint}>{link.endpoint}</li>
);
return (
<div className="navigation">
<ul>
{listItems}
</ul>
</div>
);
}
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