数组1给数组2赋值后，用unshift更改数组2后，数组1也增加了同样的元素？ - WXOPEN Club

代码如下：

var shops2=[1,2,3]

var shops1=shops2

shops1.unshift("所有门店")

console.log("shops2:",shops2,"shops1:",shops1)

输出结果如下：

shops2: (4) ["所有门店", 1, 2, 3]，shops1: (4) ["所有门店", 1, 2, 3]

数组是引用类型你的shops2 shops1指向的是同一块内存，所以该一个另一个也生效，你用Object.assign()或者是json 拷贝一份，再进行操作应该就可以了

var shops2=[1,2,3]

var shops1=[1,2,3]

shops1.unshift("所有门店")

console.log("shops2:",shops2,"shops1:",shops1)

var shops2=[1,2,3]

var shops1=JSON.parse(JSON.stringify(shops2))

shops1.unshift("所有门店")

console.log("shops2:",shops2,"shops1:",shops1)

这样呢