jquery 选择元素,选择同一个类下的固定子元素,只有father和child的索引值,该怎么选择到child<div class="father">
<div class="child">child1</div>
<div class="child">child2</div>
<div class="child">child3</div>
<div class="child">child4</div>
</div>
<div class="father">
<div class="child">child1</div>
<div class="child">child2</div>
<div class="child">child3</div>
<div class="child">child4</div>
</div>
<div class="father">
<div class="child">child1</div>
<div class="child">child2</div>
<div class="child">child3</div>
<div class="child">child4</div>
</div>
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