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Liskov Substitution Principle, LSP (Richter Substitution Principle) means that subclasses must replace their parent types. In other words, in the process of software development, after the subclass replaces the parent class, the behavior of the program is the same. Only when the subclass replaces the parent class and the function of the software is not affected can the parent class be truly reused, and the subclass can also add new behaviors to the parent class. In order to look at an example of violation of LSP principles, the specific code is as follows:明明说好的，项羽却又不听话了，唉。After the setup is successful, the module will be installed in D:\ vueProject\ nodejs\ node_global with the command npm install XXX-g刘邦本来就极为痛恨尹旭的这种做法，没想到韩信也参与进来了。黎章停了一会，才对她耳语道：我刚才想，咱们如厕始终是个大问题，怎么才能想出个万全的主意来。身为一个现代军校生，要是在这方面落后了，那可就真的该汗颜了。This time of the year is the best period for persistent dyeing, because the herb is astringent and rich in tannic acid, making the fabric critical, anti-corrosive and dorless even after sweating. An additional dyeing agent is worth mending: the sun. In fact, expose to sunlight will deep the fabric's color; this is commonly referred to as "the sun's dye".