说明：  本文针对性的研究了多目标演化算法，实现了包括NSGA-II、SPEA2已有的经典多目标优化进化算法在多目标优化问题中的应用
(Targeted research multi-objective evolutionary algorithm to achieve multi-objective optimization evolutionary algorithm NSGA-II, SPEA2 than classic multi-objective optimization problem)