```scala
lass CustomStrategy extends BaseStrategy with LazyLogging {


  override def format(value: String, strategyParam: String): String = {
    val manager = new ScriptEngineManager()
    val engine = manager.getEngineByName(CustomStrategy.ENGINE_NAME)
    try {
      engine.put(CustomStrategy.JS_FUNCTION_PARAM, value)
      engine.eval(strategyParam)
    } catch {
      case e: ScriptException =>
        logger.warn("Script execute failure", e)
    }
    value
  }
}


object CustomStrategy {
  val JS_FUNCTION_PARAM = "value"
  val ENGINE_NAME = "javascript"
}

```