React-Cannot read property 'state' of undefined at handleClick 報錯原因
react在新版本中，修改了對state的處理方式 解決辦法：1.由於state設置在了作用域內部，引用時可以使用如代碼20行的方式改變this指向修改state的值。 2.也可以使用setState設置
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相關文章
- 1. can't read property 'status' of undefined at eval 報錯
- 2. react報錯 TypeError: Cannot read property 'setState' of undefined
- 3. Uncaught TypeError: Cannot read property ‘forEach‘ of undefined React相關報錯原因
- 4. Cannot read property '$el' of undefined at VueComponent
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- 10. "Cannot read property 'length' of undefined"報錯處理