document
.
addEventListener
(
“DOMContentLoaded”
,
function
(
)
{
var
nut
=
document
.
querySelectorAll
(
“button”
)
;
var
nut
=
nut
[
0
]
;
var
menu
=
document
.
querySelectorAll
(
“.menu”
)
;
var
menu
=
menu
[
0
]
;
var
manhinhden
=
document
.
querySelectorAll
(
“.manhinhden”
)
;
var
manhinhden
=
manhinhden
[
0
]
;
nut
.
onclick
=
function
(
)
{
menu
.
classList
.
add
(
‘menuhienra’
)
;
manhinhden
.
classList
.
add
(
‘manhinhdenhienra’
)
;
}
manhinhden
.
onclick
=
function
(
)
{
manhinhden
.
classList
.
remove
(
‘manhinhdenhienra’
)
;
menu
.
classList
.
remove
(
‘menuhienra’
)
;
}
}
,
false
)
