selectAllChange(selection) {
      // If the selected number is the same as the requested number, select the child node, otherwise clear the selection
      if (selection && selection.length === crud.data.length) {
        selection.forEach(val => {
          crud.selectChange(selection, val)
        })
      } else {
        crud.getTable().clearSelection()
      }
    }
/**
     * Used for multiple selection in tree form, select all
     * @param selection
     */
Used for multiple selection in tree form, select all
@param selection
Used for multiple selection in tree form select all @param selection
selectAllChange(selection) {
      if (selection && selection.length === crud.data.length) {
        selection.forEach(val => {
          crud.selectChange(selection, val)
        })
      } else {
        crud.getTable().clearSelection()
      }
    }
selectAllChange ( selection ) { if ( selection && selection . length === crud . data . length ) { selection . forEach ( val => { crud . selectChange ( selection , val ) } ) } else { crud . getTable ( ) . clearSelection ( ) } }
Used for multiple selection in tree form, select all
 @param selection
Used for multiple selection in tree form select all @param selection
// If the selected number is the same as the requested number, select the child node, otherwise clear the selection