react-hook 与计数器

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1 分钟

react-hook 与计数器

2020-03-30

post

Hook 是 React 16.8 的新增特性，官网有一个相当简单的示例来展示它的用法

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import React, { useState } from 'react';
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function Example() {
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  const [count, setCount] = useState(0);
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  return (
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    <div>
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      <p>You clicked {count} times</p>
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      <button onClick={() => setCount(count + 1)}>
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        Click me
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      </button>
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    </div>
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  );
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}

一见倾心，它的简洁深深打动了我。于是我决定为它添加几行代码写个计数器:

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import React, { useState } from 'react';
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function Example () {
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  const [count, setCount] = useState(0);
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  const countdown = () => {
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    setTimeout(() => {
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      setCount(count + 1)
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      countdown()
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    }, 1000)
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  }
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  return (
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    <div>
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      <p>You clicked {count} times</p>
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      <button onClick={countdown}>
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        Click me
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      </button>
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    </div>
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  );
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}