一、jQuery排序
eq（）排序，可以看作是一个筛选方法
- jQuery 中获得的对象，内部包含选择的一组原生 js 对象，在 jQuery 对象中会进行一个新的大的排序，这个排序与原来的 HTML 结构没有关系。
所以eq() 方法在 jQuery 对象中通过下标获取某个对象，下标是 jQuery 对象中的大的排序的下标。
//选中所有p标签
var $ps = $("p");
//生成了一个jquery对象，内部包含了所有的元素js对象
// 是一个类数组对象，内部会按照获取顺序进行一个大排序
// 排序与自己原来的父级没有关系，只与在jQuery对象中的新的位置有关
// 给指定位置对象添加颜色
$ps.eq(1).css("background-color","pink")
$ps.eq(4).css("background-color","skyblue")
$ps.eq(8).css("background-color","purple")
$ps.eq(7).css("background-color","lightgreen")
$ps.eq(10).css("background-color","orange")
//对所有获取的元素进行了排序，跟原来的结构没有关系
第三组div里p标签
<div class="b3">
<p></p>
<p class="b2p"></p>
<p></p>
<p></p>
<p></p>
</div>
----------
<script>
// 通过类名选中标签
$(".b2p").eq(2).css("background-color","red")
//得到第3组类名为b2p的 p 标签，让它变成红色
</script>
二、index（）方法
- jQuery 对象调用
index()方法时，得到的是它自己在 HTML 结构中的兄弟中的下标位置。与新生成的jQuery 对象内部的大排序没有关系。 - 它依赖于自身元素在父级中同级元素之间的位置
//index（） 兄弟中的排序
$ps.click(function(){
//点击输出自己的index值
console.log($(this).index());
})
上图为依次点击图中p标签后，所显示结果
jQuery中设置排他方法，在jQuery中可以通过this特殊设置进行链式调用，让兄弟通过siblings方法，批量设置成默认效果。
三、应用：Tab栏特效中的排他
- 自己的级别的排他：给自己this添加（要添加的属性）类名，让其他的兄弟删除该类名。
- 对应的部分的排他：给对应位置的元素添加 （要添加的属性）类名，其他兄弟删除该类名。
- 找对应关系，使用的是自己的index（）下标，让另一组中下标相同的项作为对应项。
- 通过选中另一组的对应项利用eq（）方法选择下标项。
html部分：
<style>
*{
margin: 0;
padding: 0;
}
ul{
list-style: none;
}
.tab{
width: 360px;
height: 200px;
border-top: 2px solid #206f96;
margin: 100px;
float: left;
}
.tab .title{
width: 360px;
height: 40px;
overflow: hidden;
}
.tab .title span{
float: left;
width: 88px;
height: 38px;
border: 1px solid #52819c;
border-bottom: 1px solid #52819c;
background-color: #c0f3f7;
font: 16px/34px "SunSim";
text-align: center;
}
.tab .title span.current{
height: 40px;
background-color: rgb(255, 255, 255);
}
.tab .title span a{
color: rgb(34, 34, 34);
text-decoration: none;
}
.tab .detail{
height: 258px;
padding: 17px 0 0 9px;
}
.tab .detail ul{
display: none;
}
.tab .detail ul.current{
display: block;
}
.tab .detail ul li a{
color: #000;
text-decoration: none;
}
.tab .detail ul li.first{
font-weight: bold;
}
</style>
</head>
<body>
<div class="tab">
<div class="title">
<span class="current"><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >上路</a></span>
<span><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >中路</a> / <a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >辅助</a></span>
<span><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >打野</a></span>
<span><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >下路</a></span>
</div>
<div class="detail">
<ul class="current">
<li class="first"><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >夏侯惇</a></li>
<li><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >李信</a></li>
<li><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >曜</a></li>
<li><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >吕布</a></li>
</ul>
<ul>
<li class="first"><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >上官婉儿</a></li>
<li><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >弈星</a></li>
<li><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >甄姬</a></li>
<li><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >女娲</a></li>
</ul>
<ul>
<li class="first"><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >赵云</a></li>
<li><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >露娜</a></li>
<li><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >娜可露露</a></li>
<li><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >夏侯惇</a></li>
</ul>
<ul>
<li class="first"><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >后羿</a></li>
<li><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >虞姬</a></li>
<li><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >狄仁杰</a></li>
<li><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >鲁班</a></li>
</ul>
</div>
</div>
</body>script部分:
<script src="https://www.atool.online/jq/jquery-1.12.4.min.js"></script>
<script>
//获取元素
var $spans = $(".tab .title span");
//添加鼠标移上事件
$spans.mouseenter(function(){
// 存储对应span下标的下标值，后面需要找到对应的ul
var ind = $(this).index();
// 自己级别的排他
//$(this).addClass("current").siblings().removeClass("current");
$(".tab .detail ul").eq(ind)
.addClass("current").siblings().removeClass("current")
</script>上面的方法在一个tab栏中效果实现没有问题， 但是当页面有多个tab栏时，jQuery对象中大排序和index获取的顺序就会不统
出现问题
解决方法：span和ul的查找全部使用链式调用，通过节点关系查找
<script src="https://www.atool.online/jq/jquery-1.12.4.min.js"></script>
<script>
// 查找所有对应ul时，不要单独选择所有的ul，通过当前的 this 的节点关系查找
// 链式调用的方式，找到自己父级中的兄弟中的所有子级
$(this).addClass("current").siblings().removeClass("current")
.parent().siblings().children().eq(ind).addClass("current")
.siblings().removeClass("current");
// title的兄弟detail
})
</script>
jQuery 对象进行的操作都是批量操作，批量操作只能执行一些简单的效果，如果想对 JQ 对象中的每一个元素以及内部的后
代元素进行一些复杂操作，程序很难执行
each（）遍历
each（）的参数是一个函数
作用：对jQuery对象中的元素每一个都执行函数内部的操作
each方法基本原理就是for循环，从对象的下标为0的项一直遍历到最后一项，然后对每一项进行操作
优点：
each的函数内部也有一个this，指向的是进来遍历的每一次的元素。
<body>
<div class="box">
<p></p>
<p></p>
<p></p>
<p></p>
<h2>h2</h2>
</div>
<div class="box">
<p></p>
<p></p>
<p></p>
<p></p>
<h2>h2</h2>
</div>
</body>
<script src="https://www.atool.online/jq/jquery-1.12.4.min.js"></script>
<script>
var $box = $(".box");
//每个div内的第二个p添加红色
$box.each(function(){
$(this).children().eq(1).css("background-color","pink");
})
</script>each的函数可以传一个参数i，i表示的是这一次的遍历对象在整体的jQuery对象大排序中的下标位置
//通过each()操作
$ps.each(function(i){
// i 记录的是这一次遍历时，当前元素在jQuery对象大排序中的位置
$(this).click(function(){
console.log($(this).index())
//这个内部的this是事件源
console.log(i);
})
})
同理，如果想实现表格隔列变色的话，依靠jQuery大排列顺序来实现奇偶不同变色的话，后期若给表格再添加列，都会出现问题，无法对应。所以使用each（）方法，将每一行作为一个操作单元，让每一行中的列进行隔列变色
var $trs = $("tr");
$trs.each(function(){
$(this).children(":odd").css("background-color","skyblue");
})另一种方法就是使用td判断，只要不使用jQuery的大排序，就不会影响后期插入列
$("td").each(function(){
//判断当前td在父级中所处的位置
if($(this).index() % 2 == 0){
$(this).css("background-color","skyblue");
}
})到此这篇关于基于jQuery排序及应用实现Tab栏特效的文章就介绍到这了,更多相关jQuery实现Tab栏特效内容请搜索阿兔在线工具以前的文章或继续浏览下面的相关文章希望大家以后多多支持阿兔在线工具！
