<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style>
#div1,
#div3 {
width: 400px;
height: 300px;
border: 3px solid orange;
background: #33B2C7;
float: left;
}
#head:after {
content: ‘‘;
display: block;
clear: both;
overflow: hidden;
}
#div2,
#div4 {
width: 300px;
height: 200px;
border: 3px solid goldenrod;
background: #004099;
}
p {
width: 200px;
height: 100px;
border: 3px solid olivedrab;
background: #0000FF;
}
.bd * {
display: block;
border: 2px solid gray;
margin-top: 20x;
}
</style>
<script src="jquery-2.2.4.min.js"></script>
<script>
$(window).load(function() {
/*---向下遍历---*/
//查找第一层级的子元素
$(‘#div1‘).children(‘p‘).css({
‘background‘: ‘red‘
});
//查找所有的子元素
$(‘#div1‘).find(‘p‘).css({
‘background‘: ‘red‘
});
/*------end-----*/
/*-------向上遍历-----*/
//次层级父元素
$(‘a‘).parent(‘#pId‘).css("background", ‘orange‘);
//所有的父元素
$(‘a‘).parents().css("border", ‘1px solid orange‘);
//父元素直到某元素
// $(‘a‘).parentsUntil($(‘#div3‘)).html("parentUntil加的");
/*---------end-------*/
/*-----同级遍历-----*/
/* siblings ,next,nextuntil,nextAll,pre, preAll, preUntil*/
//所有同级
$(‘h4‘).siblings().text(function(i, old) {
return old + " siblings";
});
$(‘h4‘).next().text(function(i, old) {
return old + " next添加的";
})
$(‘h4‘).nextAll().text(function(i, old) {
return old + " nextAll添加的";
})
$(‘h3‘).nextUntil(‘h6‘,‘h5‘).text(function(i, old) {
return old + " nextUntil添加的";
})
$(‘h3‘).prev().text(function(i, old) {
return old + " pre添加的";
})
$(‘h3‘).prev().text(function(i, old) {
return old + " pre添加的";
})
$(‘h3‘).prevAll().text(function(i, old) {
return old + " preALL添加的";
})
$(‘h4‘).prevUntil(‘h1‘,‘h3‘).text(function(i, old) {
return old + " preUntil添加的";
})
/*------------------*/
})
</script>
</head>
<body>
<div id="head">
<div id="div1">div1
<div id="div2">div2
<p>
<a>Hello</a>
</p>
</div>
<p><a>机构数量工具</a></p>
</div>
<div id="div3">div1
<div id="div4">div2
<p id="pId">
<a>Hello</a>
</p>
</div>
</div>
</div>
<div class="bd">
<p>p</p>
<h1>H1</h1>
<h2>H2</h2>
<h3>H3</h3>
<h4>H4</h4>
<h5>H5</h5>
<h6>H6</h6>
</div>
</body>
</html>
原文：http://www.cnblogs.com/yqlog/p/5576553.html