first

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n.? ??, ? ?? ???, [??] ? ??, ??; ; ????

adj. ??, ??, ??

jquery ? ?? ??? ???

??: :first ???? ? ?? ??? ?????. ?? ???? ???: ?? ?? ?? ??? ???? ? ?? ??? ???? ?? ?? ??? ?? ?????.

??: ??$(":first")

jquery ? ?? ??? ?

<html>
<head>
<script type="text/javascript" src="http://apps.bdimg.com/libs/jquery/2.1.1/jquery.min.js"></script>
<script type="text/javascript"> 
 
$(document).ready(function(){
    $("p:first").css("background-color","#B2E0FF");
});
</script>	
</head>
<body>
<html>
<body>
<h1>Welcome to php中文網(wǎng)</h1>
<p class="intro">php教程視頻</p>
<p>php手冊</p>
<p>php詞典</p>
<div id="choose">
Who is your favourite:
<ul>
<li>php教程視頻</li>
<li>php手冊</li>
<li>php詞典</li>
</ul>
</div>
</body>
</html>
</body>
</html>
???? ?? ?

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