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来自 , 2019-12-01, 写在 JavaScript, 查看 107 次.
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//获取id=div1下的子元素的个数
$
(
'#div1'
)
.
children
(
)
.
length
;
//获取id=div1下的span元素个数
$
(
'#div1'
)
.
children
(
'span'
)
.
length
;
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