[Code Demo](https://link.segmentfault.com/?enc=uA1wgGBjKnNGxKPfSTwGdA%3D%3D.HRHbasdFHfwf1vx0%2BOxEs%2BHM%2BGh8qMJ8j9aOdbmCS7xFZPbaIBvgaVlCRSZ9em%2Bdbrt7DVshPy0QxzxdnXb9oOU2%2BEdV76eCZuc5xtzsA5X%2BUCoTYfXIKvANRBWHFWeW9usBsn3hq2Ndf3RFypWo88URoEPqVZFmRU7lj4wI4PILqX64UvStSP8K61Sx3BD6emdJp9sjNR93kpPrbc6PTPFrhyAJcMV36inyJdTYI1sdDh4IUnYVRfW9k3jwoIDVd0qGOQUz59xf8sAgwt%2Bx39aukUlgTKq%2FI6apIS%2Bbx2SVIV9NltHX0SQXxOHbsdQSQ2PQjXApF8lnlo7cVlrZVUMxan24JoAY%2FH8bWBPP6PYi8tSjbCwKgBTJa8K10O%2BDUOj9JDRbqKQDCcE8dyvl60NJArTq4Lq9ebeqiJoSr6304mosZ4XK%2F6yCu9cFKrSVIVE1obCj3xmqe8Mjlv%2BTo0lTN6GrNpXZzq3y0w5XkaWkk44HUlvn4nAS3kpT1DDPdpFM5MhsJJ0SgtQQiHDyWlLB9wDhgxT4CAKzwPZEkVE%2FD8W%2B49w5k4Tii3hiknNTPxQ0tOrxcEQq4B%2BZEqrZx5wJFnMa5njnRxYDKkqTHneydQnywiywoD5YTSzroeIEsk4AizahWh%2FJooTTanYIGElg1py4FmQp6c4SqZln1aYfY2JJfLZKNDFrEMg7ZYg5QA5O1FNyA5JKWyJ9z3tp2uEEtTRUYjTr4PhM%2BcZosuXVIXwzuCLzK0svVAKqhYSLR31iO9QYDBLxJHafMVFbKtLtsovBiSHD3yRZH6BAbc8ArXONasrECp%2FyB7w9dUOOu%2BfL8B9%2FN4X%2FIeveM28t3OhMpr9serD%2Fz8b7KtjYgCTgYokHdwKAHq8Sfsv5NkZ0y4RtttiX9iyFvAhCG2c1Wmg7cNISIE82YthO7vXaoxH%2BpdvQnj9C8q4b1TVszC81pKLt9WODsDw6oOAMH6isDS4ve8heLSgpZtE9M40vrqwUvCkzDlc57SGjR2u0Y8XeT25m7I6P3wwKs%2B1YmCTDsi5GkePJwOF5%2BdX0E45WAbW5TmL3DDQ9OWqGVJXR1Nta2cLm1LZPv%2F6XTDbb1OB8wK5ho%2BLbVX6AnXYq8SE3U8pETYKGBMHf%2FO%2FdyAOSSc4kKaMaWIzdenuQW002TUXzsn45oqZ7IXvSTmaooyxC7wbylun%2FNIWFDR9M0cS9CWMKhOp1nK%2BsXGLTG%2Bprp0kE9eHHVP5HMoNTrU%2Bg7iajIsirCrPgXVsakalWIKZ%2BgKcSBilQFrwYGLEuj5LBLX8%2BaNxfDMowO3t1y7f5VgY9npxOLvy8H7NlT%2BFl7TIJo4ewWiG66YCKtFBLzPnAa0cHZHLI8TKRzeo2Q2Rgq20mLBUbSw4C24hoQLK4BRaIWaEEBHNQO9LqBsJuwPssD6g0wzlW%2B%2F46I9CXdV%2B%2Fi8K6ehCOeobCuBKj7n6RHzDjX%2FIKgCelZOtEh2PvOxm71mE2Wlv4uFPGE2UVmoGFhXsKiBHn3Kzpipj3B0HT%2BZar7veyxEBIp%2BQrF5zemlF1pwWNf%2FCV7hKP9hpvcHM5BCxRXbZ1ujw0GcPjDo9edwkKeL3QWBndEPUkYdZZO0%2Bo0RfoS%2B4de%2B2cbsHgt3tH71mm4ljnChBAv2aLQzrhPajwhSrV1sBEEFsVKbxScWB2cwzN2wURqU6oIBJR9SkhUsG4kW454ENP9qw7QkqpKPlU%2BtZlUomURf4SaFzQNYv%2FnHfX%2FfTQ4lDZood3fEfQekIIK7iVkHHm5gntm4YRAdFFJ48k1QesiZtSwJZvtz%2F1XYr2%2FvlFoAzOMNgxScioEpymI3y3rM%2B1mjKS1syWBfNPQ2FCMZhyH4C37iZPcbyOpqHFkzb0lF%2B7RoMaAfYsVRkptVvrzOYEftT4HrZ3NauePYvQBHL5CP6p7pjCr%2FWnR37rKQB4Za72J7SQ8JIntuM%2FVh%2F%2FAoPrV8XF6SJFozbxWzvWI%2FdOm7NWn%2BHRPFV%2BvgVMDcDMi5Cuw8Y5RV677F3Pu57Gm%2FB9Vb7daJkNBq4TEkTVHUIYBTh0mRqLzPXAaO8q19oClewFnxxaJfATPvuT6ZU2sfyc34MuI6KTCnLudyNIKJFmrmB0cQeYl8d4BZOoBEHYFDZDrbLp297uww0IwB7S0CDZ106oQjia8C3OkAjbeO1KwDV07hB3rqSsL%2B4qTRNaoNT9%2B20LwCIDhG8eaxONV8rxRKHaqWz0XDtgmCcZTXyDUg%2BUhOLFHiRUUaJCiQ1q0i8NwLQthSLF9RXqFwPQC8QHMIL5EKz53PTGjbX5gwOtKzED2UzbH3CuleqYum8ecLbXmVPIuUqAtatEDsr6khHPf%2F4YfpihWOlym9nZRxZAk5w9RVWT29xsv35SHbobBZ76tmOzneRbS%2B%2BQpDObZAKaFyk%2Bm9R98e0Ohh%2B8qGsX5wqjlAccSxl%2BwfJhMF%2F7ZJReYN5td0H2cWqsOHaItA5VqD1iltjcjRBHj21y1q4YqYRGpzLA%2FfNj%2FfVhVSnFPzhlsgzBzexb4nDPzuM%3D) 为什么这个React Demo的列表没有展示出来? this.setState 是一个异步操作? 所以导致log时 没有输出更新后的值? 那为什么页面没有重新渲染 ?