one . According to the requirements, we need to make an organization structure tree, as shown in the figure below. The pink in the middle is the root node, tracing the parent and child nodes to the left and right respectively. The left parent node clicks the left button to generate the parent node of the parent node, and the right child node clicks the right button to generate the child node of the child node. This kind of tree structure how to layout ah, ask you to provide ideas..