Beginner JS, encountered Can not read propoty of 'removeAttributes' is null

Beginner JS, encountered Can not read propoty 'removeAttributes' of null

After the query answer a lot of bigwigs, and even from the stack overflow also looked for answers, bigwigs to answer in principle, but has been tried, did not solve my actual problem, then carefully checked the code found is html the name and js acquired no names on, after the change, to solve the problem.
Then think about this question careless, really. . . Mouse throw it. . . Manual [funny]

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Origin blog.csdn.net/zlsjune123/article/details/103949884