问题
I have this div with a bunch of other divs and images. The main div is m-carousel-inner. What I want to do is select the first img element within this div. How would I go about doing this in javascript or jquery?
<div class="m-carousel-inner">
<div class="m-item">
<div class="m-card-light">
<div class="mqc_img">
<img src="http://placehold.it/280x210">
</div><!-- end .mqc_img -->
<div class="mqc_info">
<h5>Title</h5>
Lorem ipsum dolor sit amet
</div><!-- end .mqc_info -->
</div>
</div>
<div class="m-item">
<div class="m-card-light">
<div class="mqc_img">
<img src="http://placehold.it/280x210">
</div><!-- end .mqc_img -->
<div class="mqc_info">
<h5>Title</h5>
Lorem ipsum dolor sit amet
</div><!-- end .mqc_info -->
</div>
</div>
<div class="m-item">
<a href="#">
<div class="m-card-light">
<div class="mqc_img">
<img src="http://placehold.it/280x210">
</div><!-- end .mqc_img -->
<div class="mqc_info">
<h5>Title</h5>
Lorem ipsum dolor sit amet
</div><!-- end .mqc_info -->
</div>
</a>
</div>
<div class="m-item">
<div class="m-card-light">
<div class="mqc_img">
<img src="http://placehold.it/280x210">
</div><!-- end .mqc_img -->
<div class="mqc_info">
<h5>Title</h5>
Lorem ipsum dolor sit amet
</div><!-- end .mqc_info -->
</div>
</div>
<div class="m-item">
<div class="m-card-light">
<div class="mqc_img">
<img src="http://placehold.it/280x210">
</div><!-- end .mqc_img -->
<div class="mqc_info">
<h5>Title</h5>
Lorem ipsum dolor sit amet
</div><!-- end .mqc_info -->
</div>
</div>
<div class="m-item">
<div class="m-card-light">
<div class="mqc_img">
<img src="http://placehold.it/280x210">
</div><!-- end .mqc_img -->
<div class="mqc_info">
<h5>Title</h5>
Lorem ipsum dolor sit amet
</div><!-- end .mqc_info -->
</div>
</div>
<div class="m-item">
<div class="m-card-light">
<div class="mqc_img">
<img src="http://placehold.it/280x210">
</div><!-- end .mqc_img -->
<div class="mqc_info">
<h5>Title</h5>
Lorem ipsum dolor sit amet
</div><!-- end .mqc_info -->
</div>
</div>
<div class="m-item">
<div class="m-card-light">
<div class="mqc_img">
<img src="http://placehold.it/280x210">
</div><!-- end .mqc_img -->
<div class="mqc_info">
<h5>Title</h5>
Lorem ipsum dolor sit amet
</div><!-- end .mqc_info -->
</div>
</div>
<div class="m-item">
<div class="m-card-light">
<div class="mqc_img">
<img src="http://placehold.it/280x210">
</div><!-- end .mqc_img -->
<div class="mqc_info">
<h5>Title</h5>
Lorem ipsum dolor sit amet
</div><!-- end .mqc_info -->
</div>
</div>
<div class="m-item">
<div class="m-card-light">
<div class="mqc_img">
<img src="http://placehold.it/280x210">
</div><!-- end .mqc_img -->
<div class="mqc_info">
<h5>Title</h5>
Lorem ipsum dolor sit amet
</div><!-- end .mqc_info -->
</div>
</div>
<div class="m-item">
<div class="m-card-light">
<div class="mqc_img">
<img src="http://placehold.it/280x210">
</div><!-- end .mqc_img -->
<div class="mqc_info">
<h5>Title</h5>
Lorem ipsum dolor sit amet
</div><!-- end .mqc_info -->
</div>
</div>
</div><!-- end .m-carousel-inner -->
Thank you.
回答1:
Like this?
$('.m-carousel-inner').find('img:first');
Fiddle
See :first
First part $('.m-carousel-inner') is the selector for your container element with class .m-carousel-inner which will return the jquery wrapped DOM element, and apply .find('img:first') to find the first instance of img as its child at any level.
回答2:
in jquery you could
<script>$('.m-carousel-inner img:first');</script>
回答3:
you can also use jQuery first() function with the jQuery selector
<script> $('.m-carousel-inner img').first(); </script>
来源：https://stackoverflow.com/questions/17602283/how-would-i-select-the-first-image-in-this-div-with-jquery