说明：   ％--- --- --- --- ----- ％--- 名称：带交叉因子的改进PSO算法 ％------功能：求解多维无约束优化问题 ％------特点：收敛性强，还可以加入变异算子
(-------------------- Name: with cross-factor function to improve the PSO algorithm------: Solving multi-dimensional unconstrained optimization problems------ Features: strong convergence, but also by adding mutation operator)