lang
="en"
>
>
charset
="utf-8"
>
>
js reference vs copytitle
>
head
>
>
>
let name =
"arvin"
let name2 = name
console.
log(name,name2)
//arvin arvin
name =
'蘋果'
console.
log(name,name2)
//蘋果 arvin
let number =
2let number2 = number
console.
log(number,number2)
//2 2
number =
4 console.
log(number,number2)
//4 2
let bool1 =
true
let bool2 = bool1
console.
log(bool1,bool2)
//true true
bool1 =
false
console.
log(bool1,bool2)
//false true
const players =
['wes'
,'sarah'
,'ryan'
]const team = players
team[3]
='修改了'
console.
log(players,team)
//相同 同一塊堆記憶體
console.
log(players===team)
//true
const team2 = players.
slice()
;//es6展開操作符
const team3 =
[...players]
console.
log(team2)
team2[4]
='我又修改了'
team3[4]
='我也修改了'
console.
log(players,team,team2,team3)
//team2、team3指向了乙個新的堆記憶體
const person =
const dev = person
dev.name =
"小明"
console.
log(person,dev)
//小明 22 小明 22
const dev2 = object.
assign
(,person,
)const dev3 =
//展開操作符
dev3.name =
'小亮'
console.
log(person, dev2, dev3)
//小明 22 小王 22 小亮 22
const author =
}const au2 = object.
assign
(,author)
//淺層次複製
const au3 =
json
.parse
(json
.stringify
(author)
)//深層次複製
console.
log(au2===author)
//false
au2.name =
'王小明'
au2.social.wechat =
'lala - alice --check'
console.
log(author , au2)
=== au2.social
console.
log(au2.social === author.social)
//true
console.
log(au3.social === author.social)
//false
const arr =[1
,2,3
,4]function
fn(arr3)
fn(arr)
script
>
body
>
html
>
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