text: Blockly.Blocks['sensitive_set'] = {
    init: function() {
      this.appendDummyInput()
          .appendField("选择识别灵敏度")
          .appendField(new Blockly.FieldDropdown([["高","1"], ["中","2"], ["低","3"]]), "sensitive_select");
      this.setPreviousStatement(true, null);
      this.setNextStatement(true, null);
      this.setColour(230);
   this.setTooltip("");
   this.setHelpUrl("");
    }
  };