snaker-core/src/main/java/org/snaker/engine/core/SnakerEngineImpl.java
public List<Task> executeTask(String taskId, String operator) {
		return executeTask(taskId, operator, null);
	}
public List<Task> executeTask(String taskId, String operator) {
		return executeTask(taskId, operator, null);
	}
根据任务主键ID，操作人ID执行任务