1. The questions are as follows

When the background returns the menu ID containing the half-selected state; The element document’s this.$refs.tree.setCheckedKeys(res.data.checkedKeys) method does not resolve the issue

2. The solution is as follows (use setChecked)

The key code

res.data.checkedKeys.forEach(val= > {
          this.$nextTick(() = > {
            this.$refs.tree.setChecked(val, true.false)})})// res.data.checkedKeys: returns the selected id array in the background
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