<!DOCTYPE html>
<
html
lang
=
"en"
>
<
head
>
<
meta
charset
=
"UTF-8"
>
<
meta
name
=
"viewport"
content
=
"width=device-width, initial-scale=1.0"
>
<
meta
http-equiv
=
"X-UA-Compatible"
content
=
"ie=edge"
>
<
title
>模拟开关灯</
title
>
<
script
src
=
'./jquery.js'
>
<
/
script
>
<
style
>
.co
{
background
:
#acacac
};
<
/
style
>
</
head
>
<
body
>
<
input
type
=
"button"
value
=
"關燈"
>
<
script
>
$
(
function
(){
var
onOff
=
true
;
//创建一个开关
$
(
'input'
).
on
(
'click'
,
function
(
e
){
if
(
$
(
this
).
val
()
==
'關燈'
){
$
(
this
).
val
(
'開燈'
);
}
else
{
$
(
this
).
val
(
'關燈'
);
}
onOff
=!
onOff;
$
(document.body).
toggleClass
(
'co'
);
})
})
<
/
script
>
</
body
>
</
html
>
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