选取指定(p)父元素下的第一个子元素(无关目标元素在父元素中所处的位置):

实例:

<!DOCTYPE html>
<html lang='zh-cn'>
<head>
<title>Insert you title</title>
<meta http-equiv='description' content='this is my page'>
<meta http-equiv='keywords' content='keyword1,keyword2,keyword3'>
<meta http-equiv='Content-Type' content='text/html; charset=utf-8'>
<script type='text/javascript' src='./js/jquery-1.12.1.min.js'></script>
<style type='text/css' >
    *{margin:0;padding:0;}
    html{font:400 15px/1.2em 'Courier New';color:#666;}
    div > *{margin:10px 0;cursor:pointer;}
    #demo{width:750px;margin:75px auto;}
    button{padding:5px 15px;border:0;outline:none;margin-top:-5px;border-radius:2px;font:400 12px/1.2em 'Courier New';}
    .active{background-color:yellow;transition: .3s;}
    .hover{background-color:red;transition: .3s}
    p{text-indent:8px;}
</style>
<script type='text/javascript'>
        /**
           概述
              选取指定(p)父元素下的第一个子元素(无关目标元素在父元素中所处的位置)
        */
    $(function(){
         $('p:first-of-type').addClass('active');    
    });
</script>
</head>
<body>
    <div id='demo'>     
        <ul id='list'>      
            <li>The first paragraph in div.</li>
            <li>The first paragraph in div.</li>
            <li>The first paragraph in div.</li>
            <li>The first paragraph in div.</li>
            <li>The first paragraph in div.</li>
        </ul>
        <p class='test'>The first paragraph in div.</p>
        <div style='border:1px solid #3695BC'>      
            <p>The first paragraph in div.</p>
        </div>
        <div style='border:1px solid #3695BC'>
            <p>The first paragraph in another div.2</p>
            <p>The last paragraph in another div.2</p>
        </div>
        <div>
            <p>The first paragraph in div.</p>
        </div>
        <div style='border:1px solid #3695BC'>
           <span style='white-space: pre-wrap;'> The first span in div.</span>
           <p>The first paragraph in div.</p>
           <span style='white-space: pre-wrap;'> The first span in div.</span>
        </div>
    </div>
</body>
</html>

 

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