jquery :last-child doesn’t work? ? ?
Paste the source code
<!DOCTYPE html> <html> <head> <style> span.solast { text-decoration:line-through; } </style> <script src="http://code.jquery.com/jquery-1.9.1.js"></script> </head> <body> <div> <span>John,</span> <span>Karl,</span> <span>Brandon,</span> <span>Sam</span> <div id="clearFloat"></div> </div> <div> <span>Glen,</span> <span>Tane,</span> <span>Ralph,</span> <span>David</span> <div id="clearFloat"></div> </div> <script> $("div span:last-child").css({color:"red", fontSize:"80%"}) </script> </body> </html>
Why is the sentence
$("div span:last-child").css({color:"red", fontSize:"80%"})
added after
Can't it take effect? CollapseMy purpose is to get the last span element
under each div and set the css style
$.each($("body>div"),function(i){ $(this).children("span").last().<a href="https://www.baidu.com/s?wd=css&tn=44039180_cpr&fenlei=mv6quAkxTZn0IZRqIHckPjm4nH00T1YLuyu9rjRkujNWnvfvrjIB0ZwV5Hcvrjm3rH6sPfKWUMw85HfYnjn4nH6sgvPsT6KdThsqpZwYTjCEQLGCpyw9Uz4Bmy-bIi4WUvYETgN-TLwGUv3EPHRLnWDzPj0Y" target="_blank" class="baidu-highlight">css</a>({color:"red", fontSize:"80%"}) });
to
$("div span:last").css({color:"red", fontSize:"80%"})
Because the last child is no longer span.
My purpose is to get the last span element under each div
Using last can only match one element
The above is the detailed content of jquery selector: last-child does not work solution. For more information, please follow other related articles on the PHP Chinese website!

实现方法:1、用“$("img").delay(毫秒数).fadeOut()”语句,delay()设置延迟秒数;2、用“setTimeout(function(){ $("img").hide(); },毫秒值);”语句,通过定时器来延迟。

修改方法:1、用css()设置新样式,语法“$(元素).css("min-height","新值")”;2、用attr(),通过设置style属性来添加新样式,语法“$(元素).attr("style","min-height:新值")”。

区别:1、axios是一个异步请求框架,用于封装底层的XMLHttpRequest,而jquery是一个JavaScript库,只是顺便封装了dom操作;2、axios是基于承诺对象的,可以用承诺对象中的方法,而jquery不基于承诺对象。

增加元素的方法:1、用append(),语法“$("body").append(新元素)”,可向body内部的末尾处增加元素;2、用prepend(),语法“$("body").prepend(新元素)”,可向body内部的开始处增加元素。

删除方法:1、用empty(),语法“$("div").empty();”,可删除所有子节点和内容;2、用children()和remove(),语法“$("div").children().remove();”,只删除子元素,不删除内容。

on()方法有4个参数:1、第一个参数不可省略,规定要从被选元素添加的一个或多个事件或命名空间;2、第二个参数可省略,规定元素的事件处理程序;3、第三个参数可省略,规定传递到函数的额外数据;4、第四个参数可省略,规定当事件发生时运行的函数。

去掉方法:1、用“$(selector).removeAttr("readonly")”语句删除readonly属性;2、用“$(selector).attr("readonly",false)”将readonly属性的值设置为false。

方法:1、用“$("tr").click(function(){})”给表格行元素绑定点击事件,并设置处理函数;2、在函数中,用“$(this).index()+1”获取点击元素的行数即可。index()获取值从0开始计数,需进行加1处理。


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