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shplume
Workspace
Fork
Public
By
shplume
Edited
Apr 23, 2023
Fork of
Javascript 基础知识
1 star
Insert cell
Insert cell
Insert cell
{
var
age
=
12
;
// number
let
name
=
"Zhang San"
;
// string
const
PI
=
3.1415
;
// number
return
age
*
2
;
}
Insert cell
Insert cell
{
const
PI
=
3.1415
;
PI
=
1
;
// 常量不能被修改
}
Insert cell
Insert cell
Student
=
{
return
{
name
:
"Zhang San"
,
age
:
12
}
;
}
Insert cell
Student
.
age
Insert cell
Insert cell
Another
=
{
const
another
=
Object
.
create
(
Student
)
;
another
.
age
=
18
;
Student
.
salary
=
100
;
return
another
;
}
Insert cell
Another
.
salary
Insert cell
Insert cell
{
return
{
student
:
{
own
:
Object
.
getOwnPropertyNames
(
Student
)
,
proto
:
Object
.
getOwnPropertyNames
(
Student
.
__proto__
)
}
,
another
:
{
own
:
Object
.
getOwnPropertyNames
(
Another
)
,
proto
:
Object
.
getOwnPropertyNames
(
Another
.
__proto__
)
}
}
;
}
Insert cell
Insert cell
{
return
{
student
:
Object
.
keys
(
Student
)
,
another
:
Object
.
keys
(
Another
)
}
;
}
Insert cell
Insert cell
{
return
{
student
:
Object
.
values
(
Student
)
,
another
:
Object
.
values
(
Another
)
}
;
}
Insert cell
Insert cell
{
return
0.1
+
0.2
===
0.3
;
}
Insert cell
{
return
typeof
NaN
;
}
Insert cell
{
return
NaN
===
NaN
;
}
Insert cell
{
return
1
==
"1"
;
}
Insert cell
{
return
1
===
"1"
;
}
Insert cell
{
return
typeof
[
]
;
}
Insert cell
{
return
[
]
===
[
]
;
}
Insert cell
{
return
typeof
(
[
]
+
[
]
)
;
}
Insert cell
{
return
[
]
==
""
;
}
Insert cell
{
return
[
]
===
""
;
}
Insert cell
Insert cell
Insert cell
{
let
numbers
=
[
0
,
1
,
2
,
3
,
4
,
5
,
6
,
7
,
8
]
;
return
numbers
.
length
;
}
Insert cell
Insert cell
{
let
values
=
[
0
,
1
,
2
]
;
values
[
0
]
=
3
;
return
values
;
}
Insert cell
Insert cell
Insert cell
{
let
a
=
[
]
;
let
sum
=
0
;
for
(
let
i
=
0
;
i
<
10
;
i
++
)
{
sum
=
sum
+
i
;
a
[
i
]
=
sum
;
}
return
a
;
}
Insert cell
Insert cell
{
let
a
=
[
1
,
1
]
;
for
(
let
i
=
2
;
i
<
10
;
i
++
)
{
a
[
i
]
=
a
[
i
-
1
]
+
a
[
i
-
2
]
;
}
return
a
;
}
Insert cell
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