浅拷贝
const a1 = [1, 2]
const a2 = a1.concat()
const a2 = a1.slice()
const [...a2] = a1
const a2 = [...a1]
const a2 = Object.assign({}, a1)
浅拷贝
const a1 = [1, 2]
const a2 = a1.concat()
const a2 = a1.slice()
const [...a2] = a1
const a2 = [...a1]
const a2 = Object.assign({}, a1)
本文标题：深浅拷贝的几种方法
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