控制台未定义

本人在写一个效果就是拖拽改变div大小，借鉴了网上的写法，但是在使用的时候，只要调用就会报错，根据报错查找报错的地方是页面开始的地方，请问各位大牛是什么原因呢？

代码是这样的用的是beetl 本问题来自阿里云开发者社区的【11大垂直技术领域开发者社群】。https://developer.aliyun.com/article/706511 点击链接欢迎加入感兴趣的技术领域群。

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