jQuery遍历文档(重要)
什么是遍历？
jQuery 遍历，意为"移动"，用于根据其相对于其他元素的关系来"查找"（或选取）HTML 元素。以某项选择开始，并沿着这个选择移动，直到抵达您期望的元素为止。
下图展示了一个家族树。通过 jQuery 遍历，您能够从被选（当前的）元素开始，轻松地在家族树中向上移动（祖先），向下移动（子孙），水平移动（同胞）。这种移动被称为对 DOM 进行遍历。
图示解析：
- <div> 元素是 <ul> 的父元素，同时是其中所有内容的祖先。
- <ul> 元素是 <li> 元素的父元素，同时是 <div> 的子元素
- 左边的 <li> 元素是 <span> 的父元素，<ul> 的子元素，同时是 <div> 的后代。
- <span> 元素是 <li> 的子元素，同时是 <ul> 和 <div> 的后代。
- 两个 <li> 元素是同胞（拥有相同的父元素）。
- 右边的 <li> 元素是 <b> 的父元素，<ul> 的子元素，同时是 <div> 的后代。
- <b> 元素是右边的 <li> 的子元素，同时是 <ul> 和 <div> 的后代。
 |
祖先是父、祖父、曾祖父等等。后代是子、孙、曾孙等等。同胞拥有相同的父。 |
|---|
---------------jQuery 遍历 - 祖先
祖先是父、祖父或曾祖父等等。
通过 jQuery，您能够向上遍历 DOM 树，以查找元素的祖先。
向上遍历 DOM 树
这些 jQuery 方法很有用，它们用于向上遍历 DOM 树：
- parent()
- parents()
- parentsUntil()
jQuery parent() 方法
parent() 方法返回被选元素的直接父元素。
该方法只会向上一级对 DOM 树进行遍历。
下面的例子返回每个 <span> 元素的的直接父元素：
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<style>
.ancestors *
{
display: block;
border: 2px solid lightgrey;
color: lightgrey;
padding: 5px;
margin: 15px;
}
</style>
<script src="https://cdn.bootcss.com/jquery/1.10.2/jquery.min.js">
</script>
<script>
$(document).ready(function(){
$("span").parent().css({"color":"red","border":"2px solid red"});
});
</script>
</head>
<body> <div class="ancestors">
<div style="width:500px;">div (曾祖父元素)
<ul>ul (祖父元素)
<li>li (父元素)
<span>span</span>
</li>
</ul>
</div> <div style="width:500px;">div (祖父元素)
<p>p (父元素)
<span>span</span>
</p>
</div>
</div> </body>
</html>
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32S8qSfHnuXktzSkVymOso7VkvWID0DrL4TkvvpLQF2Kp3pGW8Ouhdceq+Pdh1sizJq2HdF2dWLfdpPLWWaOf4iXfbceaWIoOo3n/F1A89vsIHsF5vSEviutP0E2Kjv6Qn7vE7g9s3T93G7400N8MvTcvk0uV8qeq6qsZHsGwBNupNaRnM1Q8ePu7s/WCqHbx1m8bP51sWlqdlkIe5+b2/97IPqwyuAE494SwtwEatfdXSWTU8mml77zUzdfPaNSHPfK6lE4j5h4D7ZzWTluYs0p+2GR1HWoCNekNaxk8aXxcZUx+ZbNoyucro7NN7bXgzZemq5f5uUcw/Ep1YLg1XT+1tmrFuOYZrF/dagK16x238wZ3r+9WrqU/jV5dz59JWWuJf+K+k5bacmFk0jD43n0jL5EHGK5zqcu68YNECbNVb0lL3LgXdns6d/qKX/qpmesDRR2D+8zb+qXd75+FVuMSVvf7lselnAu77phuiLMBmvSst8VJf8zJ1kyV5w2W4euqNPIzI5CPDg+ONvkWsKG8Pg93aVlVVv2fpXwdgMz4nLaPZ+PHNlOEPzl/9uu/1/NfS9JYvbXwS3wbQ+UIB91mArfqktHzKtzrGfFknwNt8VloAWAFpASCYtAAQTFoACCYtAASTFgCCSQsAwaQFgGDSAkAwaQEgmLQAEExaAAgmLQAEkxYAgkkLAMGkBYBg0gJAsHWn5evLZrPZbO/ZXiAtNpvNZkttL9hCWgD4S9ICQDBpASCYtAAQTFoACCYtAASTFgCCSQsAwaRlG36+68Px3ScBsIy0bIO0ABsiLYsd66+v+ud3+PLPd/ti989dvz8LvhThcN+7/l72JQrfP83OqgOsirQsdUjN4MdD/fVdH685+a1/DvVXnon+0aplonkA7yIti/z+1F/f9WD2Ph7qr696OOEfb+uJVxyXLVm6Z3KYHg3gb+00LdcrVD+/9c93O1k/WGyMlyzprjTv9S9wRZi513KcOX+Av7TrtHSvIx2+EuuSxmjivgbpkFwrXHe+3i853EZevA1qt2T/+/m74wKsxK7T0puLp++HD6+G3UvzW3+P1grttamJd9sLWakdZk5yej308/3yVTiAILtOy+DW92HiHsmDOxnHQ6JPD+6oL03L9ENiP791/ZtYXbndAqyHtLQOEwuCR7N2Pw+z83vvlsncqqUds3ux7rf+Tl24kxZgPaSl9R+rlmao67sLHgLu3RGZS8v1Js19/6YxX/3SLDtJgL+067SMb2NMfuBx6g7/9UcP9feh/p595njwOMAgLZ2bPemPWHbLMVq7uNcCrMeu09JO9J0HuhLmHu09jKf+lJ/vUR5GaZla9LRro84r3TR6QgxYj12n5efYuVv+MAxTE/f1IlWzXDiOVkKjPXtv9tNyPaXeMwGd1dI9LekLXz7XAqzJvtOy+MtRxhN68+mTiY/oD3Y+THwks3f7pJOldlF1exjs/mjZ72+/ZxOnB/BG0rLUfeEyuLuedmzbMH8PJnVux/44yYcOmnOYe+IZ4I9Jy2Lr/BbI59MFkJu0ABBsp2kBIB9pASCYtAAQTFoACCYtAASTFgCCSQsAwaQFgGDSAkAwaQEgmLQAEExaAAgmLQAEkxYAgkkLAMGkBYBg0rLkHAD2Zg1z7xMHzDd06mjSAvA/1jD3PnHAfEOnjvbXvx7A1m1x7pUWgFXb4twrLQCrtsW5V1oAVm2Lc6+0AKzaFudeaQFYtS3OvdICsGpbnHulBWDVtjj3SgvAqm1x7pUWgFXb4twrLQCrtsW5V1oAVm2Lc6+0AKzaFufeD0pLWZxuivL6UnU5n07nS1VdzqP3xj/VfassTqdTUXZ+8HypXjlzgP+z9rk3ecB8Q6eOlu3XK4vu5F9ern+8leH+Tln0IlFdzvec3DLU2bH9+3WgQZUA/sCq596pA+YbOnW0XL9es8gYvpwoQnU5TzWim6dBgyaPAJDZmufeyQPmGzp1tFy/XrM8GU79/ZXIVX99MxjgPsSoJA+SBJDRmufeyQPmGzp1tIy/XnvTpHfBK5mWXkDuPzN6Z5QW91uAP7fyuTd9wHxDp46W/de7rT6uVXi8ahnmQ1qAFdrE3Ds8YL6hU0f7k1+vjUfiXsvgzU4sejtLC7ASm5l7uwfMN3TqaPlu47cZ6NwV6a9hhqnp1eJ2bUxagHVZ89w7ecB8Q6eOlu/XS34+pelBOfWxlv7HVlwQA1Zo3XPvxAHzDZ062h//enoAbN4G515pAVi3Dc690gKwbhuce6UFYN02OPd+eFoANm+Lc6+0AKzaFudeaQFYtS3OvdICsGpbnHulBWDVtjj3SgvAqm1x7t1kWgD2Zg1z7xMHzDd06mjSAvA/1jD3PnHAfEOnjvbqrwfA06QFgGDSAkAwaQEgmLQAEExaAAgmLQAEkxYAgkkLAMGkBYBg0gJAMGkBIJi0ABBMWgAIJi0ABJMWAIJJCwDBpAWAYNICQDBpASDYLtJis9lstr/fXiAtNpvNZkttL1h3WgDYIGkBIJi0ABBMWgAIJi0ABJMWAIJJCwDBpAWAYNICQDBpASCYtAAQTFoACCYtAASTFgCCSQsAwaQFgGDSAkAwaQEgmLQAEExaAAiWPS0A7JO0ABAsS1oAYAlpASCYtAAQTFoACCYtAASTFgCCSQsAwaQFgGDSAkAwaQEgmLQAEExaAAgmLQAEkxYAgv0DnqO2RbGabewAAAAASUVORK5CYII=" alt="" />
jQuery parents() 方法
parents() 方法返回被选元素的所有祖先元素，它一路向上直到文档的根元素 (<html>)。
下面的例子返回所有 <span> 元素的所有祖先：
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<style>
.ancestors *
{
display: block;
border: 2px solid lightgrey;
color: lightgrey;
padding: 5px;
margin: 15px;
}
</style>
<script src="https://cdn.bootcss.com/jquery/1.10.2/jquery.min.js">
</script>
<script>
$(document).ready(function(){
$("span").parents().css({"color":"red","border":"2px solid red"});
});
</script>
</head> <body class="ancestors">body (曾曾祖父元素)
<div style="width:500px;">div (曾祖父元素)
<ul>ul (祖父元素)
<li>li (父元素)
<span>span</span>
</li>
</ul>
</div>
</body> </html>
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" alt="" />
jQuery parentsUntil() 方法
parentsUntil() 方法返回介于两个给定元素之间的所有祖先元素。
下面的例子返回介于 <span> 与 <div> 元素之间的所有祖先元素：
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<style>
.ancestors *
{
display: block;
border: 2px solid lightgrey;
color: lightgrey;
padding: 5px;
margin: 15px;
}
</style>
<script src="https://cdn.bootcss.com/jquery/1.10.2/jquery.min.js">
</script>
<script>
$(document).ready(function(){
$("span").parentsUntil("div").css({"color":"red","border":"2px solid red"});
});
</script>
</head> <body class="ancestors"> body (曾曾祖父元素)
<div style="width:500px;">div (曾祖父元素)
<ul>ul (祖父元素)
<li>li (父元素)
<span>span</span>
</li>
</ul>
</div>
</body> </html>
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" alt="" />
---------------jQuery 遍历 - 后代-----------------
后代是子、孙、曾孙等等。
通过 jQuery，您能够向下遍历 DOM 树，以查找元素的后代。
向下遍历 DOM 树
下面是两个用于向下遍历 DOM 树的 jQuery 方法：
- children()
- find()
jQuery children() 方法
children() 方法返回被选元素的所有直接子元素。
该方法只会向下一级对 DOM 树进行遍历。
下面的例子返回每个 <div> 元素的所有直接子元素：
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<style>
.descendants *
{
display: block;
border: 2px solid lightgrey;
color: lightgrey;
padding: 5px;
margin: 15px;
}
</style>
<script src="https://cdn.bootcss.com/jquery/1.10.2/jquery.min.js">
</script>
<script>
$(document).ready(function(){
$("div").children().css({"color":"red","border":"2px solid red"});
});
</script>
</head>
<body> <div class="descendants" style="width:500px;">div (当前元素)
<p>p (儿子元素)
<span>span (孙子元素)</span>
</p>
<p>p (儿子元素)
<span>span (孙子元素)</span>
</p>
</div> </body>
</html>
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" alt="" />、
您也可以使用可选参数来过滤对子元素的搜索。
下面的例子返回类名为 "1" 的所有 <p> 元素，并且它们是 <div> 的直接子元素：
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<style>
.descendants *
{
display: block;
border: 2px solid lightgrey;
color: lightgrey;
padding: 5px;
margin: 15px;
}
</style>
<script src="https://cdn.bootcss.com/jquery/1.10.2/jquery.min.js">
</script>
<script>
$(document).ready(function(){
$("div").children("p.1").css({"color":"red","border":"2px solid red"});
});
</script>
</head>
<body> <div class="descendants" style="width:500px;">div (当前元素)
<p class="1">p (儿子元素)
<span>span (孙子元素)</span>
</p>
<p class="2">p (儿子元素)
<span>span (孙子元素)</span>
</p>
</div> </body>
</html>
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alt="" />
jQuery find() 方法
find() 方法返回被选元素的后代元素，一路向下直到最后一个后代。
下面的例子返回属于 <div> 后代的所有 <span> 元素：
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<style>
.descendants *
{
display: block;
border: 2px solid lightgrey;
color: lightgrey;
padding: 5px;
margin: 15px;
}
</style>
<script src="https://cdn.bootcss.com/jquery/1.10.2/jquery.min.js">
</script>
<script>
$(document).ready(function(){
$("div").find("span").css({"color":"red","border":"2px solid red"});
});
</script>
</head>
<body> <div class="descendants" style="width:500px;">div (当前元素)
<p>p (儿子元素)
<span>span (孙子元素)</span>
</p>
<p>p (儿子元素)
<span>span (孙子元素)</span>
</p>
</div> </body>
</html>
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alt="" />
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" alt="" />
jQuery 遍历 - 同胞(siblings)
同胞拥有相同的父元素。
通过 jQuery，您能够在 DOM 树中遍历元素的同胞元素。
在 DOM 树中水平遍历
有许多有用的方法让我们在 DOM 树进行水平遍历：
- siblings()
- next()
- nextAll()
- nextUntil()
- prev()
- prevAll()
- prevUntil()
jQuery siblings() 方法
siblings() 方法返回被选元素的所有同胞元素。
下面的例子返回 <h2> 的所有同胞元素：
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<style>
.siblings *
{
display: block;
border: 2px solid lightgrey;
color: lightgrey;
padding: 5px;
margin: 15px;
}
</style>
<script src="https://cdn.bootcss.com/jquery/1.10.2/jquery.min.js">
</script>
<script>
$(document).ready(function(){
$("h2").siblings().css({"color":"red","border":"2px solid red"});
});
</script>
</head>
<body class="siblings"> <div>div (父元素)
<p>p</p>
<span>span</span>
<h2>h2</h2>
<h3>h3</h3>
<p>p</p>
</div> </body>
</html>
aaarticlea/png;base64,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" alt="" />
您也可以使用可选参数来过滤对同胞元素的搜索。
下面的例子返回属于 <h2> 的同胞元素的所有 <p> 元素：
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<style>
.siblings *
{
display: block;
border: 2px solid lightgrey;
color: lightgrey;
padding: 5px;
margin: 15px;
}
</style>
<script src="https://cdn.bootcss.com/jquery/1.10.2/jquery.min.js">
</script>
<script>
$(document).ready(function(){
$("h2").siblings("p").css({"color":"red","border":"2px solid red"});
});
</script>
</head>
<body class="siblings"> <div>div (父元素)
<p>p</p>
<span>span</span>
<h2>h2</h2>
<h3>h3</h3>
<p>p</p>
</div> </body>
</html>
aaarticlea/png;base64,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" alt="" />
jQuery next() 方法
next() 方法返回被选元素的下一个同胞元素。
该方法只返回一个元素。
下面的例子返回 <h2> 的下一个同胞元素：
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<style>
.siblings *
{
display: block;
border: 2px solid lightgrey;
color: lightgrey;
padding: 5px;
margin: 15px;
}
</style>
<script src="https://cdn.bootcss.com/jquery/1.10.2/jquery.min.js">
</script>
<script>
$(document).ready(function(){
$("h2").next().css({"color":"red","border":"2px solid red"});
});
</script>
</head>
<body class="siblings"> <div>div (父元素)
<p>p</p>
<span>span</span>
<h2>h2</h2>
<h3>h3</h3>
<p>p</p>
</div> </body>
</html>
aaarticlea/png;base64,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" alt="" />
jQuery nextAll() 方法
nextAll() 方法返回被选元素的所有跟随的同胞元素。
下面的例子返回 <h2> 的所有跟随的同胞元素：
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<style>
.siblings *
{
display: block;
border: 2px solid lightgrey;
color: lightgrey;
padding: 5px;
margin: 15px;
}
</style>
<script src="https://cdn.bootcss.com/jquery/1.10.2/jquery.min.js">
</script>
<script>
$(document).ready(function(){
$("h2").nextAll().css({"color":"red","border":"2px solid red"});
});
</script>
</head>
<body class="siblings"> <div>div (父元素)
<p>p</p>
<span>span</span>
<h2>h2</h2>
<h3>h3</h3>
<p>p</p>
</div> </body>
</html>
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jQuery nextUntil() 方法
nextUntil() 方法返回介于两个给定参数之间的所有跟随的同胞元素。
下面的例子返回介于 <h2> 与 <h6> 元素之间的所有同胞元素：
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<style>
.siblings *
{
display: block;
border: 2px solid lightgrey;
color: lightgrey;
padding: 5px;
margin: 15px;
}
</style>
<script src="https://cdn.bootcss.com/jquery/1.10.2/jquery.min.js">
</script>
<script>
$(document).ready(function(){
$("h2").nextUntil("h6").css({"color":"red","border":"2px solid red"});
});
</script>
</head>
<body class="siblings"> <div>div (父元素)
<p>p</p>
<span>span</span>
<h2>h2</h2>
<h3>h3</h3>
<h4>h4</h4>
<h5>h5</h5>
<h6>h6</h6>
<p>p</p>
</div> </body>
</html>
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REK9G4prXYIlxFaxmqRtQAGJ1oJbqi1V5qaRbAqYhWojNazRve7Q0CnJBoARCGaAEQhmgBEIZoARCGaAEQhmgBEIZoARCGaAEQxllHC4CIximIaAEwgHEKMqFoAXCeRAuAMEQLgDBEC4AwRAuAMEQLgDBEC4AwRAuAMEQLgDBEC4AwRAuAMEQLgDBEC4AwRAuAMEQLgDBCRisDIKxxCiJaAAxgnIJMLlpDnQ8A4xAtAMIQLQDCEC0AwhAtAMIQLQDCEC0AwhAtAMIQLQDCEC0AwhAtAMIQLQDCEC0AwhCt1LzMsywv5/Myz1aK6pi3AmAwopVaxSov54sHqqL5EwCnJFqpRbSStdW8zK22ACZBtFKr7cHmY1VhrQUwCaKV2hUtSy2ACRCtlJUWwISJVqrjmpZmAUzFmNH6f6c5fUU8Q0TbAAAAAElFTkSuQmCC" alt="" />
jQuery prev(), prevAll() & prevUntil() 方法
prev(), prevAll() 以及 prevUntil() 方法的工作方式与上面的方法类似，只不过方向相反而已：它们返回的是前面的同胞元素（在 DOM 树中沿着同胞之前元素遍历，而不是之后元素遍历）。
---------------------jQuery 遍历- 过滤(重要)-----------------------
缩小搜索元素的范围
三个最基本的过滤方法是：first(), last() 和 eq()，它们允许您基于其在一组元素中的位置来选择一个特定的元素。
其他过滤方法，比如 filter() 和 not() 允许您选取匹配或不匹配某项指定标准的元素。
jQuery first() 方法
first() 方法返回被选元素的首个元素。
下面的例子选取首个 <div> 元素内部的第一个 <p> 元素：
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="https://cdn.bootcss.com/jquery/1.10.2/jquery.min.js">
</script>
<script>
$(document).ready(function(){
$("div p").first().css("background-color","yellow");
});
</script>
</head>
<body> <h1>欢迎访问我的主页</h1>
<div>
<p>这是 div 中的一个段落。</p>
</div> <div>
<p>这是另外一个 div 中的一个段落。</p>
</div> <p>这是一个段落。</p> </body>
</html>
aaarticlea/png;base64,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" alt="" />
jQuery last() 方法
last() 方法返回被选元素的最后一个元素。
下面的例子选择最后一个 <div> 元素中的最后一个 <p> 元素：
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="https://cdn.bootcss.com/jquery/1.10.2/jquery.min.js">
</script>
<script>
$(document).ready(function(){
$("div p").last().css("background-color","yellow");
});
</script>
</head>
<body> <h1>欢迎访问我的主页</h1>
<div>
<p>这是 div 中的一个段落。</p>
</div> <div>
<p>这是另外一个 div 中的一个段落。</p>
</div> <p>这是一个段落。</p> </body>
</html>
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" alt="" />
jQuery eq() 方法
eq() 方法返回被选元素中带有指定索引号的元素。
索引号从 0 开始，因此首个元素的索引号是 0 而不是 1。下面的例子选取第二个 <p> 元素（索引号 1）：
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="https://cdn.bootcss.com/jquery/1.10.2/jquery.min.js">
</script>
<script>
$(document).ready(function(){
$("p").eq(1).css("background-color","yellow");
});
</script>
</head>
<body> <h1>欢迎访问我的主页</h1>
<p>菜鸟教程 (index 0).</p>
<p>http://www.runoob.com (index 1)。</p>
<p>google (index 2).</p>
<p>http://www.google.com (index 3)。</p> </body>
</html>
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" alt="" />
jQuery filter() 方法
filter() 方法允许您规定一个标准。不匹配这个标准的元素会被从集合中删除，匹配的元素会被返回。
下面的例子返回带有类名 "url" 的所有 <p> 元素：
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="https://cdn.bootcss.com/jquery/1.10.2/jquery.min.js">
</script>
<script>
$(document).ready(function(){
$("p").filter(".url").css("background-color","yellow");
});
</script>
</head>
<body> <h1>欢迎访问我的主页</h1>
<p>菜鸟教程 (index 0).</p>
<p class="url">http://www.runoob.com (index 1)。</p>
<p>google (index 2).</p>
<p class="url">http://www.google.com (index 3)。</p> </body>
</html>
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" alt="" />
jQuery not() 方法
not() 方法返回不匹配标准的所有元素。
提示：not() 方法与 filter() 相反。
下面的例子返回不带有类名 "url" 的所有 <p> 元素：
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="https://cdn.bootcss.com/jquery/1.10.2/jquery.min.js">
</script>
<script>
$(document).ready(function(){
$("p").not(".url").css("background-color","yellow");
});
</script>
</head>
<body> <h1>欢迎访问我的主页</h1>
<p>菜鸟教程 (index 0).</p>
<p class="url">http://www.runoob.com (index 1)。</p>
<p>google (index 2).</p>
<p class="url">http://www.google.com (index 3)。</p> </body>
</html>
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" alt="" />
上面选择器反对的都是jQuery对象，可以直接使用jQuery的方法。
例如:
bigParent 就是一个jQuery对象。
var updateTotalNum = function(obj) {
var bigParent = $7(obj).parents(".elaquesTitle_father");
var quesNum = bigParent.find(".nmb").length;// 获取到题的总数
var quesEveryScore = bigParent.find(".el_modifiedGrade").val();// 获取到每道题分数
bigParent.find(".el_BigTitle").find(".numTotal").text(
parseFloat(quesEveryScore) * parseFloat(quesNum) + "分;共")// 设置分总数
bigParent.find(".el_BigTitle").find(".numQues").text(quesNum + "题)")// 设置题总数
}
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