Blockly.Blocks['plus1'] = {
  init: function() {
    this.appendDummyInput()
        .appendField("+ 1");
    this.setPreviousStatement(true);
    this.setNextStatement(true);
    this.setColour(230);
    this.setTooltip('ajouter 1');
    this.setHelpUrl('');
  }
};