JQuery遍历元素的后代和同胞实现方法

2019-11-20 08:57:47

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1.遍历后代

children()

children() 方法返回被选元素的所有直接子元素。

<!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>无标题文档</title><style type="text/css"></style><script type="text/javascript" src="jQuery/jquery-1.12.1.js"></script><script type="text/javascript">$(function(){	$("#btn").click(function(){			$("#div1").children().each(function(i, e) {    $("#info").html($("#info").html()+"第"+i+"个直接后代是,("+$(this).attr("id")+")");   }); });});</script></head><body><input type="button" value="点击" id="btn"><div id="info"></div><div id="div1"> <div id="div2"> <div id="div3">  <div id="div4"> 		</div> </div> </div> <p id="p1"></p> <p id="p2"></p> <span id="span1"></span> <span id="span2"></span> <p id="p3"></p></div></body></html>

find()

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。

find()里必须加上selecter 如果不加就显示不了

所以里面必须加选择器例如find("*") find("span")

<!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>无标题文档</title><style type="text/css"></style><script type="text/javascript" src="jQuery/jquery-1.12.1.js"></script><script type="text/javascript">$(function(){	$("#btn").click(function(){			$("#div1").find("*").each(function(i, e) {    $("#info").html($("#info").html()+"第"+i+"个后代是,("+$(this).attr("id")+")");   }); });});</script></head><body><input type="button" value="点击" id="btn"><div id="info"></div><div id="div1"> <div id="div2"> <div id="div3">  <div id="div4"> 		</div> </div> </div> <p id="p1"></p> <p id="p2"></p> <span id="span1"></span> <span id="span2"></span> <p id="p3"></p></div></body></html>

2.遍历同胞

siblings()

siblings() 方法返回被选元素的所有同胞元素。

<!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>无标题文档</title><style type="text/css"></style><script type="text/javascript" src="jQuery/jquery-1.12.1.js"></script><script type="text/javascript">$(function(){	$("#btn").click(function(){			$("#div2").siblings().each(function(i, e) {    $("#info").html($("#info").html()+"第"+i+"个同胞是,("+$(this).attr("id")+")");   }); });});</script></head><body><input type="button" value="点击" id="btn"><div id="info"></div><div id="div1"> <div id="div2"> <div id="div3">  <div id="div4"> 		</div> </div> </div> <p id="p1"></p> <p id="p2"></p> <span id="span1"></span> <span id="span2"></span> <p id="p3"></p></div></body></html>

next()

next()被选元素的下一个同胞元素

<!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>无标题文档</title><style type="text/css"></style><script type="text/javascript" src="jQuery/jquery-1.12.1.js"></script><script type="text/javascript">$(function(){	$("#btn").click(function(){			$("#p2").next().each(function(i, e) {    $("#info").html($("#info").html()+"第"+i+"个同胞是,("+$(this).attr("id")+")");   }); });});</script></head><body><input type="button" value="点击" id="btn"><div id="info"></div><div id="div1"> <div id="div2"> <div id="div3">  <div id="div4"> 		</div> </div> </div> <p id="p1"></p> <p id="p2"></p> <span id="span1"></span> <span id="span2"></span> <p id="p3"></p></div></body></html>

nextAll()

nextAll() 方法返回被选元素的所有跟随的同胞元素。

<!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>无标题文档</title><style type="text/css"></style><script type="text/javascript" src="jQuery/jquery-1.12.1.js"></script><script type="text/javascript">$(function(){	$("#btn").click(function(){			$("#p2").nextAll().each(function(i, e) {    $("#info").html($("#info").html()+"第"+i+"个同胞是,("+$(this).attr("id")+")");   }); });});</script></head><body><input type="button" value="点击" id="btn"><div id="info"></div><div id="div1"> <div id="div2"> <div id="div3">  <div id="div4"> 		</div> </div> </div> <p id="p1"></p> <p id="p2"></p> <span id="span1"></span> <span id="span2"></span> <p id="p3"></p></div></body></html>

nextUntil()

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。

<!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>无标题文档</title><style type="text/css"></style><script type="text/javascript" src="jQuery/jquery-1.12.1.js"></script><script type="text/javascript">$(function(){	$("#btn").click(function(){			$("#p2").nextUntil("#p3").each(function(i, e) {    $("#info").html($("#info").html()+"第"+i+"个同胞是,("+$(this).attr("id")+")");   }); });});</script></head><body><input type="button" value="点击" id="btn"><div id="info"></div><div id="div1"> <div id="div2"> <div id="div3">  <div id="div4"> 		</div> </div> </div> <p id="p1"></p> <p id="p2"></p> <span id="span1"></span> <span id="span2"></span> <p id="p3"></p></div></body></html>

prev()

prev()
prevAll()
prevUntil()
prev=previous=前面的

所以遍历的是指定元素的前面同胞这个效果和next() 相仿就不举例子了

3.过滤

first()

first() 方法返回被选元素的首个元素。

<!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>无标题文档</title><style type="text/css"></style><script type="text/javascript" src="jQuery/jquery-1.12.1.js"></script><script type="text/javascript">$(function(){	$("#btn").click(function(){			$("div p").first().each(function(i, e) {    $("#info").html($("#info").html()+"("+$(this).attr("id")+")");   }); });});</script></head><body><input type="button" value="点击" id="btn"><div id="info"></div><div id="div1"> <div id="div2"> <div id="div3">  <div id="div4"> 		</div> </div> </div> <p id="p1"></p> <p id="p2"></p> <span id="span1"></span> <span id="span2"></span> <p id="p3"></p></div></body></html>

last()

last() 方法返回被选元素的最后一个元素。

<!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>无标题文档</title><style type="text/css"></style><script type="text/javascript" src="jQuery/jquery-1.12.1.js"></script><script type="text/javascript">$(function(){	$("#btn").click(function(){			$("div p").last().each(function(i, e) {    $("#info").html($("#info").html()+"("+$(this).attr("id")+")");   }); });});</script></head><body><input type="button" value="点击" id="btn"><div id="info"></div><div id="div1"> <div id="div2"> <div id="div3">  <div id="div4"> 		</div> </div> </div> <p id="p1"></p> <p id="p2"></p> <span id="span1"></span> <span id="span2"></span> <p id="p3"></p></div></body></html>

eq()

eq() 方法返回被选元素中带有指定索引号的元素。

<!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>无标题文档</title><style type="text/css"></style><script type="text/javascript" src="jQuery/jquery-1.12.1.js"></script><script type="text/javascript">$(function(){	$("#btn").click(function(){			$("div p").eq(1).each(function(i, e) {    $("#info").html($("#info").html()+"("+$(this).attr("id")+")");   }); });});</script></head><body><input type="button" value="点击" id="btn"><div id="info"></div><div id="div1"> <div id="div2"> <div id="div3">  <div id="div4"> 		</div> </div> </div> <p id="p1"></p> <p id="p2"></p> <span id="span1"></span> <span id="span2"></span> <p id="p3"></p></div></body></html>

filter()

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。

<script type="text/javascript">$(function(){	$("#btn").click(function(){			$("div p").filter("#p2").each(function(i, e) {    $("#info").html($("#info").html()+"("+$(this).attr("id")+")");   }); });});</script>

not()

not() 方法返回不匹配标准的所有元素。

not() 方法与 filter() 相反。

<!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>无标题文档</title><style type="text/css"></style><script type="text/javascript" src="jQuery/jquery-1.12.1.js"></script><script type="text/javascript">$(function(){	$("#btn").click(function(){			$("div p").not("#p2").each(function(i, e) {    $("#info").html($("#info").html()+"("+$(this).attr("id")+")");   }); });});</script></head><body><input type="button" value="点击" id="btn"><div id="info"></div><div id="div1"> <div id="div2"> <div id="div3">  <div id="div4"> 		</div> </div> </div> <p id="p1"></p> <p id="p2"></p> <span id="span1"></span> <span id="span2"></span> <p id="p3"></p></div></body></html>