parent() 、parents()、closest() 区别示例：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" ???"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>3-11-4</title> <!-- ??引入jQuery --> <script src="../../scripts/jquery.js" type="text/javascript"></script> <script type="text/javascript"> //<![CDATA[ ?$(function(){ ?????//parent ?????$("input:eq(0)").click(function(){ ???????????resetStyle(); ???????????$(‘.item-1‘).parent().css(‘background-color‘, ‘red‘); ?????}); ?????//parents ?????$("input:eq(1)").click(function(){ ???????????resetStyle(); ???????????$(‘.item-1‘).parents(‘ul‘).css(‘background-color‘, ‘red‘); ?????}); ?????//closest ?????$("input:eq(2)").click(function(){ ???????????resetStyle(); ???????????$(‘.item-1‘).closest(‘ul‘).css(‘background-color‘, ‘red‘); ?????}); ?????function resetStyle(){ ?????????$("*").removeAttr("style"); ?????} ?}); ?//]]> ?</script></head><body><input type="button" value="parent()"/><input type="button" value="parents()"/><input type="button" value="closest()"/><ul id="one" class="level-1"> ???<li class="item-i">I</li> ???<li id="ii" class="item-ii">II ???????<ul class="level-2"> ???????????<li class="item-a"><a href="#" class="item-1">Home</a></li> ???????????<li class="item-b"><a href="#" class="item-2">Product</a></li> ???????????<li class="item-c"><a href="#" class="item-3">About</a></li> ???????</ul> ???</li> ???<li class="item-iii">III</li></ul></body></html> 鼠标移动到 a 上去，立即显示文字提示效果：this 当前对象，e 鼠标
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>文字提示</title> <!-- ??引入jQuery --> <script src="../../scripts/jquery.js" type="text/javascript"></script><style type="text/css">body{ ???margin:0; ???padding:40px; ???background:#fff; ???font:80% Arial, Helvetica, sans-serif; ???color:#555; ???line-height:180%;}p{ ???clear:both; ???margin:0; ???padding:.5em 0;}/* tooltip */#tooltip{ ???position:absolute; ???border:1px solid #333; ???background:#f7f5d1; ???padding:1px; ???color:#333; ???display:none;}</style><script type="text/javascript">//<![CDATA[$(function(){ ???var x = 10; ?????var y = 20; ???$("a.tooltip").mouseover(function(e){ ??????????this.myTitle = this.title; ???????this.title = ""; ???????????var tooltip = "<div id=‘tooltip‘>"+ this.myTitle +"<\/div>"; //创建 div 元素 ???????$("body").append(tooltip); ???//把它追加到文档中 ???????$("#tooltip") ???????????.css({ ???????????????"top": (e.pageY+y) + "px", ???????????????"left": (e.pageX+x) ?+ "px" ???????????}).show("fast"); ?????//设置x坐标和y坐标，并且显示 ???}).mouseout(function(){ ???????????????this.title = this.myTitle; ???????$("#tooltip").remove(); ??//移除 ????}).mousemove(function(e){ ???????$("#tooltip") ???????????.css({ ???????????????"top": (e.pageY+y) + "px", ???????????????"left": (e.pageX+x) ?+ "px" ???????????}); ???});})//]]></script></head><body><p><a href="#" class="tooltip" title="这是我的超链接提示1.">提示1.</a></p><p><a href="#" class="tooltip" title="这是我的超链接提示2.">提示2.</a></p><p><a href="#" title="这是自带提示1.">自带提示1.</a></p><p><a href="#" title="这是自带提示2.">自带提示2.</a> </p></body></html>鼠标移动到图片上，立即在旁边显示大图效果：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>图片提示</title> <!-- ??引入jQuery --> <script src="../../scripts/jquery.js" type="text/javascript"></script><style type="text/css">body{ ???margin:0; ???padding:40px; ???background:#fff; ???font:80% Arial, Helvetica, sans-serif; ???color:#555; ???line-height:180%;}img{border:none;}ul,li{ ???margin:0; ???padding:0;}li{ ???list-style:none; ???float:left; ???display:inline; ???margin-right:10px; ???border:1px solid #AAAAAA;}/* tooltip */#tooltip{ ???position:absolute; ???border:1px solid #ccc; ???background:#333; ???padding:2px; ???display:none; ???color:#fff;}</style><script type="text/javascript">//<![CDATA[$(function(){ ???var x = 10; ???var y = 20; ???$("a.tooltip").mouseover(function(e){ ???????this.myTitle = this.title; ???????this.title = ""; ???????????var imgTitle = this.myTitle? "<br/>" + this.myTitle : ""; ???????var tooltip = "<div id=‘tooltip‘><img src=‘"+ this.href +"‘ alt=‘产品预览图‘/>"+imgTitle+"<\/div>"; //创建 div 元素 ???????$("body").append(tooltip); ???//把它追加到文档中 ????????????????????????????????$("#tooltip") ???????????.css({ ???????????????"top": (e.pageY+y) + "px", ???????????????"left": ?(e.pageX+x) ?+ "px" ???????????}).show("fast"); ?????//设置x坐标和y坐标，并且显示 ???}).mouseout(function(){ ???????this.title = this.myTitle; ???????????$("#tooltip").remove(); ????//移除 ????}).mousemove(function(e){ ???????$("#tooltip") ???????????.css({ ???????????????"top": (e.pageY+y) + "px", ???????????????"left": ?(e.pageX+x) ?+ "px" ???????????}); ???});})//]]></script></head><body><h3>有效果：</h3> ???<ul> ???????<li><a href="images/apple_1_bigger.jpg" class="tooltip" title="苹果 iPod"><img src="images/apple_1.jpg" alt="苹果 iPod" /></a></li> ???????<li><a href="images/apple_2_bigger.jpg" class="tooltip" title="苹果 iPod nano"><img src="images/apple_2.jpg" alt="苹果 iPod nano"/></a></li> ???????<li><a href="images/apple_3_bigger.jpg" class="tooltip" title="苹果 iPhone"><img src="images/apple_3.jpg" alt="苹果 iPhone"/></a></li> ???????<li><a href="images/apple_4_bigger.jpg" class="tooltip" title="苹果 Mac"><img src="images/apple_4.jpg" alt="苹果 Mac"/></a></li> ???</ul><br/><br/><br/><br/><br/><br/><br/><br/><h3>无效果：</h3><ul> ???????<li><a href="images/apple_1_bigger.jpg" title="苹果 iPod"><img src="images/apple_1.jpg" alt="苹果 iPod" /></a></li> ???????<li><a href="images/apple_2_bigger.jpg" title="苹果 iPod nano"><img src="images/apple_2.jpg" alt="苹果 iPod nano"/></a></li> ???????<li><a href="images/apple_3_bigger.jpg" title="苹果 iPhone"><img src="images/apple_3.jpg" alt="苹果 iPhone"/></a></li> ???????<li><a href="images/apple_4_bigger.jpg" title="苹果 Mac"><img src="images/apple_4.jpg" alt="苹果 Mac"/></a></li> ???</ul></body></html>
第3章 jQuery中的DOM操作
原文地址：https://www.cnblogs.com/i-shanghai/p/9382965.html