jQuery 这是偶数还是奇数元素？
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Is this an even or odd element?
提问by mrtsherman
So I saw this questiona few moments ago on SO and it got me thinking.
所以我刚才在 SO 上看到了这个问题，这让我开始思考。
Basically the OP had something along these lines
基本上 OP 有一些类似的东西
<div>a</div>
<div>b</div>
<div>c</div>
<div>d</div>
$('div').each( function() {
//do something different based on whether even or odd div
if ($(this) == ':even') {} //invalid markup I know!
else {}
});
Is there a way to tell inside the .each()whether your current element is an odd or even instance?
有没有办法在里面.each()判断你当前的元素是奇数还是偶数？
There is the .filtermethod of jQuery, but it always returns true when it has a single element.
有.filterjQuery的方法，但是只有一个元素的时候总是返回true。
I also realize you can use the nth-child selector or set this up in other ways, but I am curious about this specific case.
我也意识到您可以使用 nth-child 选择器或以其他方式设置它，但我对这种特定情况很好奇。
回答by Sean Vieira
回答by Shef
$('div').each( function(index) {
//do something different based on whether even or odd div
if (index % 2 == 0) {} // even
else {} // odd
});
回答by Dennis
If you know that all of the elements are children of the same parent, you can use the index provided by each
如果您知道所有元素都是同一个父元素的子元素，则可以使用每个元素提供的索引
$('div').each( function(index) {
if (index%2 == 0) {}
else {}
});
otherwise, use the indexfunction which will calculate the index of the element among its siblings.
否则，使用index函数计算元素在其兄弟元素中的索引。
$('div').each( function() {
if ($(this).index()%2 == 0) {}
else {}
});
回答by H?c Huy?n Minh
Using Jquery api .is( selector )
使用 Jquery api .is( 选择器 )
$('div').each( function() {
//Check if element is even
if ($(this).is(":even")) {
}
//Check if element is odd
if ($(this).is(":odd")) {
}
});
