


This article mainly introduces the jQuery CSS3 implementation of a navigation menu with a fixed top position and a floating effect imitating the petal network. It can realize the function of the navigation bar being horizontally suspended and fixed at the top after the page slides down. It involves jQuery event response and page elements. For operating tips related to dynamic modification of attributes, friends in need can refer to the following
This article describes the example of jQuery CSS3 implementing a navigation menu with a fixed top position and a floating effect imitating the petal network. Share it with everyone for your reference, the details are as follows:
<!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 charset="UTF-8"> <title>【推荐】Jquery+CSS3仿花瓣网固定顶部位置悬浮的导航菜单</title> <style type="text/css"> body,h1,ul{margin:0;} ul li{list-style-type:none;} #header{width:100%;border-top:solid 1px #ccc;border-bottom:solid 1px #ccc;text-align:center;} h1{padding:10px 0;color:#D74452;} .nav{width:1000px;background:#fff;margin:20px auto 0;border:solid 1px #ccc;zoom:1;border-radius:5px;box-shadow:0 1px 6px rgba(0,0,0,0.1);color:#D74452;} .nav_scroll{position:fixed;width:100%;margin:0;left:0;top:0;} .nav:after{content:"";display:block;height:0;clear:both;visibility:hidden;} .nav ul li{float:left;margin:0 20px;height:30px;line-height:30px;} .nav ul li a{cursor:pointer;} .nav ul li a:hover{text-decoration:underline;} h2{height:400px;line-height:400px;} </style> <script src="jquery-1.7.2.min.js" type="text/javascript"></script> <script type="text/javascript"> $(document).ready(function(){ var topMain=$("#header").height()+20//是头部的高度加头部与nav导航之间的距离 var nav=$(".nav"); $(window).scroll(function(){ if ($(window).scrollTop()>topMain){//如果滚动条顶部的距离大于topMain则就nav导航就添加类.nav_scroll,否则就移除 nav.addClass("nav_scroll"); }else{ nav.removeClass("nav_scroll"); } }); }) </script> </head> <body> <p id="header"><h1 id="花瓣">花瓣</h1></p> <p class="nav"> <ul> <li><a>关注</a></li> <li><a>最新</a></li> <li><a>最热</a></li> <li><a>视频</a></li> <li><a>家居</a></li> <li><a>旅行</a></li> </ul> </p> <p style="background:#f9f9f9;color:#000;" id="cont"> <h2 id="">1</h2> <h2 id="">2</h2> <h2 id="">3</h2> <h2 id="">4</h2> <h2 id="">5</h2> <h2 id="">6</h2> <h2 id="">7</h2> <h2 id="">8</h2> <h2 id="">1</h2> <h2 id="">2</h2> <h2 id="">3</h2> <h2 id="">4</h2> <h2 id="">5</h2> <h2 id="">6</h2> <h2 id="">7</h2> <h2 id="">8</h2> <h2 id="">1</h2> <h2 id="">2</h2> <h2 id="">3</h2> <h2 id="">4</h2> <h2 id="">5</h2> <h2 id="">6</h2> <h2 id="">7</h2> <h2 id="">8</h2> <h2 id="">1</h2> <h2 id="">2</h2> <h2 id="">3</h2> <h2 id="">4</h2> <h2 id="">5</h2> <h2 id="">6</h2> <h2 id="">7</h2> <h2 id="">8</h2> <h2 id="">1</h2> <h2 id="">2</h2> <h2 id="">3</h2> <h2 id="">4</h2> <h2 id="">5</h2> <h2 id="">6</h2> <h2 id="">7</h2> <h2 id="">8</h2> </p> </body> </html>
The operation effect diagram is as follows:
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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。

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。

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")”。

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。

在jquery中,apply()方法用于改变this指向,使用另一个对象替换当前对象,是应用某一对象的一个方法,语法为“apply(thisobj,[argarray])”;参数argarray表示的是以数组的形式进行传递。

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。


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