使用 jQuery 计算元素

Count elements with jQuery

提问by santa

Is there a way to count how many elements on the page with a particular class?

有没有办法用特定的类来计算页面上有多少元素？

回答by David

$('.someclass').length

You could also use:

您还可以使用：

$('.someclass').size()

which is functionally equivalent, but the former is preferred. In fact, the latter is now deprecatedand shouldn't be used in any new development.

这在功能上是等效的，但前者是首选。事实上，后者现已弃用，不应在任何新开发中使用。

回答by David Houde

var count_elements = $('.class').length;

From: http://api.jquery.com/size/

来自：http: //api.jquery.com/size/

The .size() method is functionally equivalent to the .length property; however, the .length property is preferred because it does not have the overhead of a function call.

.size() 方法在功能上等同于 .length 属性；然而，首选 .length 属性，因为它没有函数调用的开销。

Please see:

请参见：

http://api.jquery.com/size/

http://api.jquery.com/size/

http://api.jquery.com/length/

http://api.jquery.com/length/

回答by g.d.d.c

Yes, there is.

就在这里。

$('.MyClass').size()

回答by IronicMuffin

I believe this works:

我相信这有效：

$(".MyClass").length 

回答by Naftali aka Neal

try this:

尝试这个：

var count_element = $('.element').length

回答by Panomosh

The best way would be to use .each()

最好的方法是使用.each()

var num = 0;

$('.className').each(function(){
    num++;
});

回答by Kiss Koppány

$('.class').length

This one does not work for me. I'd rather use this:

这个对我不起作用。我宁愿使用这个：

$('.class').children().length

I don't really know the reason why, but the second one works only for me. Somewhy, either size doesn't work.

我真的不知道原因，但第二个只对我有用。不知何故，任何一种尺寸都不起作用。

回答by neebz

use the .size()method or .lengthattribute

使用.size()方法或.length属性