Uncaught TypeError Cannot read property 'length' of undefin

分享一下我老師大神的人工智能教程。零基礎！通俗易懂！風趣幽默！還帶黃段子！希望你也加入到我們人工智能的隊伍中來！https://blog.csdn.net/jiangjunshow                 1、錯誤描述 jquery.easyui.min.js:8311 Uncaught TypeError: Cannot read property 'length' of undefin

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