<!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
>Document
</
title
>
</
head
>
<
body
>
<
input
type=
"checkbox"
class=
"inp1"
>
<
input
type=
"checkbox"
class=
"inp2"
>
<
input
type=
"radio"
class=
"inp3"
>
<
input
type=
"checkbox"
class=
"inp4"
>
</
body
>
<
script
src=
"./jquery-1.12.2.js"
></
script
>
<
script
>
// 在一堆元素中获取固定元素的方法(例子中获取的是type=checkbox的元素)
// 第一种: JS方法
var
a=
document.
getElementsByTagName(
"input");
var
b=[];
for (
var
i =
0;
i <
a.
length;
i++) {
if(
a[
i].
type==
"checkbox"){
b.
push(
a[
i]);
}
}
console.
log(
b);
// console.log(b[0]);
// console.log(b[1]);
// console.log(b[2]);
// 第二种: JQ方法
var
c=
$(
'input:checkbox');
console.
log(
c);
// console.log(c[0]);
// console.log(c[1]);
// console.log(c[2]);
<
/
script
>
</
html
>