


This article mainly introduces how to use jquery code to achieve the effect of returning the web page to the top.
When we browse the pages of major websites, we must all have encountered it. When browsing a long page, when you scroll to the lower part, a button effect similar to the return to the top will appear.
This special effect of clicking back to the top can greatly improve the user experience. Then it is very simple to implement such a function.
Below we will use a simple code example to introduce you to the functional method of using jquery to realize clicking back to the top.
<!DOCTYPE html> <html> <head> <title>回到顶部特效</title> <meta charset="UTF-8"> <script type="text/javascript" src="https://code.jquery.com/jquery-3.1.1.min.js"></script> <style> body { text-align: center; } h1 { width: 1200px; height: 1500px; background: #eee; margin: 30px auto; } a { text-decoration: none; color: #fff; } p#back { text-align: center; position: fixed; bottom: 100px; right: 60px; background: #000; border-radius: 3px; height: 50px; width: 80px; display: none; } </style> </head> <body> <h1 id="网页内容">网页内容</h1> <a href=""><p id="back"><br> 返回顶部</p></a> </body> <script> // 文档就绪 $(function () { // 获取浏览器窗口 $(window).scroll(function () { // 获取浏览器滚动条距离顶部的高度 if ($(window).scrollTop() > 150) { // 设置按钮出现 $('#back').fadeIn(1000) } else { // 设置按钮消失 $('#back').fadeOut(1000) } }) }) </script> </html>
In this code, we mainly referenced a jquery online library, and wrote some simple HTML pages and js code to judge. When the height of the scroll bar from the top is greater than 150, the setting button appears. , otherwise the button is hidden. Finally access it through the browser, the effect is as follows:
Then we drag the scroll bar down, and the button to return to the top will slowly appear, the effect is as follows:
Note:
fadeIn() The method uses the fade-in effect to display the selected element if the element is hidden . (In this example, the parameter is set to 1000 milliseconds, which means that the fade-in transition time of the selected element is 1000 milliseconds. If it is set to 0, the selected element will appear immediately.)
fadeOut() Method uses the fade out effect to hide the selected element, if the element is hidden. (Parameters are the same as above)
This article is about the introduction of jquery to achieve the effect of returning the web page to the top. It is simple and easy to understand. I hope it will be helpful to friends in need!
If you want to know more about front-end related knowledge, you can follow PHP Chinese website jQuery video tutorial or HTML video tutorial, CSS video tutorial, Bootstrap video tutorial and other related video tutorials, welcome everyone to refer to and learn!
The above is the detailed content of How to achieve the effect of clicking on the web page to return to the top in jquery? (Pictures + Videos). 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。

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。


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

AI Hentai Generator
Generate AI Hentai for free.

Hot Article

Hot Tools

mPDF
mPDF is a PHP library that can generate PDF files from UTF-8 encoded HTML. The original author, Ian Back, wrote mPDF to output PDF files "on the fly" from his website and handle different languages. It is slower than original scripts like HTML2FPDF and produces larger files when using Unicode fonts, but supports CSS styles etc. and has a lot of enhancements. Supports almost all languages, including RTL (Arabic and Hebrew) and CJK (Chinese, Japanese and Korean). Supports nested block-level elements (such as P, DIV),

SublimeText3 Linux new version
SublimeText3 Linux latest version

Notepad++7.3.1
Easy-to-use and free code editor

PhpStorm Mac version
The latest (2018.2.1) professional PHP integrated development tool

Dreamweaver CS6
Visual web development tools
