javascript - 如何获取选择数组中元素的索引？

Question

我需要获取与其父元素相关的多个元素的索引。在下面的代码中，我认为它应该为我提供相同的注释和标签索引，因为它们在相同的<ol>中但这没有发生。

$('#main-form').find('form').each(function () { //foreach form in the ol tag
    var $drop_target_index = $('.drop_targets').index($(this).closest('.drop_targets'));
    console.log($(this).closest('.drop_targets'));
    console.log( $drop_target_index);
});

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div id="main-form">
        <ol class="drop_targets">
            <li><ol class="drop_targets comments">
                <li><form></form>
    
                Item 1 </li>
            </ol>
            <ol class="drop_targets tags">
                <li><form></form>
                Item 2</li>
            </ol></li>
        </ol>
    </div>

我预计00我有01

Answer 1

将 each() 与 .drop_targets 一起使用。

$('.drop_targets .drop_targets').each(function () {
  var $drop_target_index = $(this).parent().index() + 1;
  console.log($drop_target_index);
})

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div id="main-form">
    <ol class="drop_targets">
        <ol class="drop_targets comments">
            <form></form>
            <form></form>
            <form></form>

            Item 1
        </ol>
        <ol class="drop_targets tags">
            <form></form>
            <form></form>
            <form></form>
            Item 2
        </ol>
    </ol>
</div>