ReactJs Cannot read property 'keys' of undefined

reactjs Cannot read property 'keys' of undefined

reactjs - React.JS: TypeError: Cannot read property 'filter' ...

...TypeError: Cannot read property 'map' of undefined - Stack...

2016年7月5日 - {代码...} ex1.jsx code: {代码...} console message after run:Uncaught TypeError: Cannot read property 'keys' of undefined Why?

2016年7月5日 - {代码...} ex1.jsx code: {代码...} console message after run:Uncaught TypeError: Cannot read property 'keys' of undefined Why?

ReactJs Cannot read property 'keys' of undefined http://t.cn/R5upCB6 ​​​​

Error: Cannot read property 'push' of undefined stack: Dates._rowPressed ...index.ios.js where all the views get combined:'use strict'; var React ...

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