转载---原型，原型链，继承

ps:感谢  https://blog.csdn.net/cuckooii/article/details/106229681?ops_request_misc=%257B%2522request%255Fid%2522%253A%2522164506429016780261940043%2522%252C%2522scm%2522%253A%252220140713.130102334.pc%255Fall.%2522%257D&request_id=164506429016780261940043&biz_id=0&utm_medium=distribute.pc_search_result.none-task-blog-2~all~first_rank_ecpm_v1~rank_v31_ecpm-10-106229681.first_rank_v2_pc_rank_v29&utm_term=%E5%89%8D%E7%AB%AF%E5%AF%B9%E7%BB%A7%E6%89%BF%E7%9A%84%E7%90%86%E8%A7%A3&spm=1018.2226.3001.4187