第一次使用React报错：
Warning: The tag <hzs> is unrecognized in this browser. If you meant to render a React component, start its name with an uppercase letter.
此浏览器中无法识别标记<hzs>。如果要呈现React组件，请以大写字母开头。
class hzs extends Component {
render () {
return (
<div>React is very interesting</div>
)
}
}
将hzs改为Hzs即可
