React 条件渲染 if

92 阅读 0 评论 61 点赞

我是靠谱客的博主慈祥野狼，这篇文章主要介绍React 条件渲染 if，现在分享给大家，希望可以做个参考。

{false}

复制代码

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
<html>
  <head>
      <title>Document</title>
      <script src="../react.js"></script>
      <script src="../react-dom.js"></script>
      <script src="http://cdn.bootcss.com/babel-core/5.8.38/browser.min.js"></script>
  </head>

  <body>
      <div id="reactContainer"/>

      <script type="text/babel">
        function UserGreeting(props) {
          return <h1>welcome back</h1>
        }

        function GuestGreeting(props) {
          return <h1>please sign up</h1>
        }

        function Guest(props) {
          const isLoggedIn = props.isLoggedIn

          if (isLoggedIn) {
            return <UserGreeting />
          }

          return <GuestGreeting />
        }

        ReactDOM.render(
          <Guest isLoggedIn={false}/>,
          document.getElementById('reactContainer')
        )
    </script>
  </body>
</html>