对yalmip建模语言进行了初步介绍，通过这个文档，可以对yalmip有个初步的了解，并能自己动手实现一些简单的优化模型的求解。(A preliminary introduction to the YALMIP modeling language is made. Through this document, we can have a preliminary understanding of YALMIP and can solve some simple optimization models by themselves.)