Update 03.一文彻底搞懂ReactHooks的原理和实现.md #165
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当点击事件触发再次渲染，并不会进入条件判断中的 useState。所以，cursor=2 的时候对应的变量是 num2。而其实 num2 对应的 cursor 应该是 1。就会导致`setNum2`并不起作用。
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当点击事件触发再次渲染，并不会进入条件判断中的 useState。所以，cursor=2 的时候对应的变量是 num2。而其实 num2 对应的 cursor 应该是 1。就会导致
setNum2并不起作用。