https://segmentfault.com/a/1190000021966814
js __proto__ vs prototype：https://www.google.com/search?newwindow=1&safe=strict&rlz=1C1CHWL_zh-CNCN831CN831&sxsrf=ALeKk03A2-kQ23QNt6lTSQCPtP22LDh4gg%3A1609835184482&ei=sCL0X9r0HMv2hwOBk7yoAQ&q=js+__proto__+vs+prototype&oq=js+__pro&gs_lcp=CgZwc3ktYWIQAxgBMgQIABBDMgIIADIECAAQHjIECAAQHjIECAAQHjIECAAQHjIECAAQHjIECAAQHjIECAAQHjIECAAQHjoHCCMQsAIQJzoECCMQJzoHCAAQsQMQDDoICAAQsQMQgwE6BAgAEAw6BwgjELECECc6BQgAEMsBUKAFWO8UYOcraABwAHgAgAG-AogBkA6SAQgwLjEwLjEuMZgBAKABAaoBB2d3cy13aXrAAQE&sclient=psy-ab
https://cn.vuejs.org/v2/cookbook/adding-instance-properties.html
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