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How to solve the problem of how to select the child elements of mouseover div in Jquery

黄舟
黄舟Original
2017-06-28 14:00:091140browse

There are many divs with the same class (assumed to be a), and each div has a span of the same class (assumed to be b). How can I select the span of the current div?
The method I found is 

$(".a").mouseover(function(){$(".b",this).css(...)})

but it doesn’t work for me. 

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<script type="text/javascript" src="http://ajax.aspnetcdn.com/ajax/jQuery/jquery-1.6.2.min.js"></script>
<script type="text/javascript">
$(document).ready( function() {
    $("div.a span.b").mouseover( function() { $(this).css("background-color", "red"); });
});
</script>
</head>
 
<body>
<div class="a"><span class="b">111</span></div>
<div class="a"><span class="b">222</span></div>
</body>
</html>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title></title>
    <script src="http://code.jquery.com/jquery-1.6.2.min.js" type="text/javascript"></script>
    <script type="text/javascript">
        $(document).ready(function () {
            $(".a").mouseover(function () {
                $(this).find(&#39;.b&#39;).css({color:&#39;red&#39;}); 
            });
        });
    </script>
 
</head>
<body>
<body>
<div class="a" style="border:1px solid red;">
<span class="b">111</span>
<span class="b">222</span>
</div>
<div class="a" style="border:1px solid green;">
<span class="b">333</span>
<span class="b">444</span>
</div>
</body>
 
</body>
</html>

Haha, it’s an own goal.
Didn’t you test my writing method? That's right, but I wrote the span outside the div.
That way of writing is indeed not common, I saw it on stackoverflow.

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