assign a to b
let a = [{
m: 1
}]
let b = [...a]
b[0].m = 2
console.log(a)
console.log(b)result:
[{m: 2}] / / a
[{m: 2}] / / b
when you change the attribute of an element in b, the m attribute in the corresponding element of an also changes
. so how can objects in array b be redirected to a new memory address?
expected result:
[{m: 1}] / / a
[{m: 2}] / / b
copy objects instead of reference objects. Assign, like . , is a shallow copy
let b = a.map(item=>{
return Object.assign({},item)
})let a = [{
m: 1
}]
let b = JSON.parse(JSON.stringify(a))
b[0].m = 2
console.log(JSON.stringify(a))
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