使用 jQuery 定位元素的特定 Child

Question

当我尝试使用 child 定位第二个时：

 $(".well:nth-child(2)").addClass("animated bounce");

它针对的是所有 children，而不是我希望它针对的特定 child。

命令有什么问题？

 <script> $(document).ready(function() {
$("#target1").css("color", "red");
$("#target1").prop("disabled", true);
$("#target4").remove();
$("#target2").appendTo("#right-well");
$("#target5").clone().appendTo("#left-well");
$("#target1").parent().css("background-color", "red");
$("#right-well").children().css("color", "orange");

    $(".well:nth-child(2)").addClass("animated bounce");
});
</script>

<!-- Only change code above this line. -->

<div class="container-fluid">
<h3 class="text-primary text-center">jQuery Playground</h3>
  <div class="row">
<div class="col-xs-6">
  <h4>#left-well</h4>
  <div class="well" id="left-well">
    <button class="btn btn-default target" id="target1">#target1</button>
    <button class="btn btn-default target" id="target2">#target2</button>
    <button class="btn btn-default target" id="target3">#target3</button>
  </div>
</div>
<div class="col-xs-6">
  <h4>#right-well</h4>
  <div class="well" id="right-well">
    <button class="btn btn-default target" id="target4">#target4</button>
    <button class="btn btn-default target" id="target5">#target5</button>
    <button class="btn btn-default target" id="target6">#target6</button>
  </div>
</div>

更改代码自：

$(".well:nth-child(2)").addClass("animated bounce");

至

$(".target:nth-child(2)").addClass("animated bounce");

我只完成了第二个 child 目标所需的工作

这条命令有什么错误

$(".well:nth-child(2)").addClass("animated bounce");

为什么它针对所有child人？

Answer 1

您可以使用$(".target:first-child + .target").addClass("animated bounce");

$("#target1").css("color", "red");
$("#target1").prop("disabled", true);
$("#target4").remove();
$("#target2").appendTo("#right-well");
$("#target5").clone().appendTo("#left-well");
$("#target1").parent().css("background-color", "red");
$("#right-well").children().css("color", "orange");

    $(".target:first-child + .target").addClass("animated bounce");

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<!-- Only change code above this line. -->

<div class="container-fluid">
<h3 class="text-primary text-center">jQuery Playground</h3>
  <div class="row">
<div class="col-xs-6">
  <h4>#left-well</h4>
  <div class="well" id="left-well">
    <button class="btn btn-default target" id="target1">#target1</button>
    <button class="btn btn-default target" id="target2">#target2</button>
    <button class="btn btn-default target" id="target3">#target3</button>
  </div>
</div>
<div class="col-xs-6">
  <h4>#right-well</h4>
  <div class="well" id="right-well">
    <button class="btn btn-default target" id="target4">#target4</button>
    <button class="btn btn-default target" id="target5">#target5</button>
    <button class="btn btn-default target" id="target6">#target6</button>
  </div>
</div>

Answer 2

 $(".well:nth-child(2)").addClass("animated bounce");

您需要指定子元素作为目标元素 "target" .

这是正确的方法:

 $(".well button.btn.target:nth-child(2)").addClass("animated bounce");

Answer 3

这将 select 包含 .well class
的任何元素的第二个子元素
.well :nth-child(2)
否则，这将 select 任何具有 .well class 并且是其父项
的第二个子元素的元素
.well:nth-child(2)

应该使用这个：

$(".well :nth-child(2)").addClass("animated bounce");

note the space ' ' between .well & :nth-child(2) in the selector

$(".well :nth-child(2)").addClass("animated bounce");

$("#target1").css("color", "red");
$("#target1").prop("disabled", true);
$("#target4").remove();
$("#target2").appendTo("#right-well");
$("#target5").clone().appendTo("#left-well");
$("#target1").parent().css("background-color", "red");
$("#right-well").children().css("color", "orange");

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="container-fluid">
<h3 class="text-primary text-center">jQuery Playground</h3>
  <div class="row">
<div class="col-xs-6">
  <h4>#left-well</h4>
  <div class="well" id="left-well">
    <button class="btn btn-default target" id="target1">#target1</button>
    <button class="btn btn-default target" id="target2">#target2</button>
    <button class="btn btn-default target" id="target3">#target3</button>
  </div>
</div>
<div class="col-xs-6">
  <h4>#right-well</h4>
  <div class="well" id="right-well">
    <button class="btn btn-default target" id="target4">#target4</button>
    <button class="btn btn-default target" id="target5">#target5</button>
    <button class="btn btn-default target" id="target6">#target6</button>
  </div>
</div>

使用 jQuery 定位元素的特定 Child

Target a Specific Child of an Element Using jQuery

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jquery

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