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react的函数式组件事件绑定 

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>函数式组件绑定事件.html</title>

  <script crossorigin src="https://unpkg.com/react@16/umd/react.development.js"></script>
  <script crossorigin src="https://unpkg.com/react-dom@16/umd/react-dom.development.js"></script>
</head>
<body>

  <div id="app">

  </div>
  
</body>
<script src="https://cdn.bootcdn.net/ajax/libs/babel-standalone/7.0.0-beta.3/babel.min.js"></script>
<script type="text/babel">
  function go() {
    console.log("gogogo")
  }
  // 函数式组件注册
  let item = () => {
    return (
      <div className="item">
        <button onClick={ go }>点击一下</button>
        <button onClick={ go() }>点击一下</button>   {/* react中绑定的事件函数不能加括号，加括号后会被自动执行 */}
        <hr/>
      </div>
    )
  }
  // console.log(item)   // item是个函数，所以渲染是要调用这个函数，不然会报错
  ReactDOM.render(item(), document.getElementById("app"))
</script>
</html>