在元素之前计数元素 [英] Count elements before an element

问题描述

这是一个示例:

<div class="create-q"></div>
<div class="create-q"></div>
<div class="create-q"></div>
<div class="create-q"></div> <-- im in this class : I want to know how many div with class "create-q" there is before this one. (3 in this example)
<div class="create-q"></div>
<div class="create-q"></div>

我知道如何计算，但不知道如何达到指定的格数.

I know how to count but not how to stop it once it reach a specified div..

我该如何使用jQuery?

How can I do this with jQuery ?

推荐答案

如果mydiv是对您已经在查看的元素的引用:

If mydiv is a reference to the element you're already looking at:

var n = $(mydiv).index('.create-q');

将给出该div的索引，因为它们是从零开始的，也恰好是前一个div的数量.

will give the index of that div which as they're zero-based also happens to be the number of preceding divs.

与.prevAll()不同，无论div是否具有公共父级，这都将起作用.

Unlike .prevAll() this will work regardless of whether the divs have a common parent or not.

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