JavaScript TypeError：无法读取Undefined属性'eat'

I am working on a project that solves the classic "jumbled word" puzzle found in many newspapers. The basic idea of the project is that it accepts a scrambled word (no spaces or special characters), generates every permutation of the word, checks each permutation against a "dictionary" supplied by my professor, then adds each permutation that is actually an English word to an array that is then processed further to come up with the result.I am working on a project that solves the class