JQuery遍歷元素的后代和同胞實(shí)現(xiàn)方法

2019-11-20 08:57:47

字體：大中小

供稿：網(wǎng)友

1.遍歷后代

children()

children() 方法返回被選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>無標(biāo)題文檔</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+"個(gè)直接后代是,("+$(this).attr("id")+")");   }); });});</script></head><body><input type="button" value="點(diǎn)擊" 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() 方法返回被選元素的后代元素，一路向下直到最后一個(gè)后代。

find()里必須加上selecter 如果不加就顯示不了

所以里面必須加選擇器例如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>無標(biāo)題文檔</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+"個(gè)后代是,("+$(this).attr("id")+")");   }); });});</script></head><body><input type="button" value="點(diǎn)擊" 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.遍歷同胞

siblings()

siblings() 方法返回被選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>無標(biāo)題文檔</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+"個(gè)同胞是,("+$(this).attr("id")+")");   }); });});</script></head><body><input type="button" value="點(diǎn)擊" 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()被選元素的下一個(gè)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>無標(biāo)題文檔</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+"個(gè)同胞是,("+$(this).attr("id")+")");   }); });});</script></head><body><input type="button" value="點(diǎn)擊" 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() 方法返回被選元素的所有跟隨的同胞元素。

<!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>無標(biāo)題文檔</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+"個(gè)同胞是,("+$(this).attr("id")+")");   }); });});</script></head><body><input type="button" value="點(diǎn)擊" 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() 方法返回介于兩個(gè)給定參數(shù)之間的所有跟隨的同胞元素。

<!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>無標(biāo)題文檔</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+"個(gè)同胞是,("+$(this).attr("id")+")");   }); });});</script></head><body><input type="button" value="點(diǎn)擊" 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

所以遍歷的是指定元素的前面同胞這個(gè)效果和next() 相仿就不舉例子了

3.過濾

first()

first() 方法返回被選元素的首個(gè)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>無標(biāo)題文檔</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="點(diǎn)擊" 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() 方法返回被選元素的最后一個(gè)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>無標(biāo)題文檔</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="點(diǎn)擊" 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() 方法返回被選元素中帶有指定索引號(hào)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>無標(biāo)題文檔</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="點(diǎn)擊" 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() 方法允許您規(guī)定一個(gè)標(biāo)準(zhǔn)。不匹配這個(gè)標(biāo)準(zhǔn)的元素會(huì)被從集合中刪除，匹配的元素會(huì)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() 方法返回不匹配標(biāo)準(zhǔn)的所有元素。

not() 方法與 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>無標(biāo)題文檔</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="點(diǎn)擊" 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>