this.$el.querySelectorAll is not a function [How to Solve]

Problem description
when using El tree, the error this. $el.queryselectorall is not a function is reported, which makes the tree unable to render

Problem resolution
refer to the following code snippet


Most of the errors reported are incorrect data bound by El tree. Data errors can be divided into the following two types:

Case 1:

Cause: wrong format of treeData data.
Solution: check the treeData data format, the data bound by :data must be an array.

Case 2:

Cause: The treeData array contains dirty data such as null
Solution: Delete the null and other dirty data in the data

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