jQuery ?? - ???
??? ?? ??
?? ???? ? ?? ??? ??? first(), last() ? eq()??, ?? ???? ?? ?? ?? ??? ?? ?? ??? ??? ? ????.
filter() ? not()? ?? ?? ??? ??? ???? ??? ??? ????? ???? ?? ??? ??? ? ????.
first() ???
first() ???? ??? ??? ? ?? ??? ?????.
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="http://libs.baidu.com/jquery/1.10.2/jquery.min.js"></script>
<script>
$(document).ready(function(){
$("div p").first().css("background-color","blue");
});
</script>
</head>
<body>
<div>
<p>段落1</p>
</div>
<div>
<p>段落2</p>
</div>
<p>段落3</p>
</body>
</html>? ?? <div> ?? ??? ? ?? <p> ??? ?????.
last() ???
last() ???? ??? ?? ? ??? ??? ?????.
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="http://libs.baidu.com/jquery/1.10.2/jquery.min.js"></script>
<script>
$(document).ready(function(){
$("div p").last().css("background-color","red");
});
</script>
</head>
<body>
<div>
<p>段落1</p>
</div>
<div>
<p>段落2</p>
</div>
<p>段落3</p>
</body>
</html>??? <div> ?? ??? ??? <p> ??? ?????.
eq() ???
eq() ???? ??? ?? ? ??? ??? ??? ?? ??? ?????.
??? ??? 0?? ????? ? ?? ??? ??? ??? 1? ?? 0???.
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="http://libs.baidu.com/jquery/1.10.2/jquery.min.js"></script>
<script>
$(document).ready(function(){
$("p").eq(1).css("background-color","green");
});
</script>
</head>
<body>
<p>php中文網(wǎng) (index 0).</p>
<p>http://ipnx.cn (index 1)。</p>
<p>google (index 2).</p>
<p>http://www.google.com (index 3)。</p>
</body>
</html>? ?? <p> ??(?? 1)? ?????.
filter() ???
filter() ???? ???? ??? ??? ? ????. ? ??? ???? ?? ??? ????? ???? ???? ??? ?????.
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="http://libs.baidu.com/jquery/1.10.2/jquery.min.js">
</script>
<script>
$(document).ready(function(){
$("p").filter(".url").css("background-color","yellow");
});
</script>
</head>
<body>
<p>php中文網(wǎng) (index 0).</p>
<p class="url">http://ipnx.cn (index 1)。</p>
<p>google (index 2).</p>
<p class="url">http://www.google.com (index 3)。</p>
</body>
</html>??? ??? "url"? ?? <p> ??? ?????.
not() ???
not() ???? ??? ???? ?? ?? ??? ???????.
?: not() ???? filter()? ?????.
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="http://libs.baidu.com/jquery/1.10.2/jquery.min.js">
</script>
<script>
$(document).ready(function(){
$("p").not(".url").css("background-color","gray");
});
</script>
</head>
<body>
<p>php中文網(wǎng) (index 0).</p>
<p class="url">http://ipnx.cn (index 1)。</p>
<p>google (index 2).</p>
<p class="url">http://www.google.com (index 3)。</p>
</body>
</html>??? ?? "url"? ?? ?? <p> ??? ?????.
