一.数组的浅拷贝，引用之间的拷贝，没有实现真正的拷贝
const arr = [1,2,3]
const arr1 = arr
arr1.push(2)
console.log(arr,arr1)
二.深拷贝
1.传统做法：for循环遍历
const arr = [1,2,3]
const arr1 = []
for(var i =0;i<arr.length;i++){
arr1[i] = arr[i]
}
arr[i].push(3)
console.log(arr,arr1)
2.es6 Array.from实现数组深拷贝
const arr = [1,2,3]
const arr1 = Array.from(arr)
arr1.push(4)
console.log(arr,arr1)
3.es6 .[..arr]实现数组深拷贝
const arr = [1,2,3]
const arr1 = [...arr]
arr1.push(4)
console.log(arr,arr1)
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