jQuery is a popular JavaScript library used to simplify JavaScript programming and process HTML documents. It aims to simplify the development process and improve development efficiency. By providing rich APIs and functional plug-ins, jQuery makes it easier for developers It can operate DOM, handle events, create animation effects, etc. Its popularity and wide application make it easier for developers to use and maintain existing code, and at the same time, they can also solve problems with the help of rich resources and community support.
The operating system of this tutorial: Windows 10 system, jQuery3.6.0 version, Dell G3 computer.
jQuery is a popular JavaScript library used to simplify JavaScript programming and processing HTML documents. It provides a set of powerful APIs (Application Programming Interfaces) that enable developers to more easily operate DOM (Document Object Model), handle events, create animation effects, send Ajax requests, implement data interaction, etc.
At first, JavaScript had many difficulties in handling the differences between different browsers, and the code was complex and error-prone to write. To solve these problems, John Resig created jQuery in 2006. The core concept of jQuery is "write less code and do more things". It is committed to simplifying the development process and improving development efficiency.
The design goal of jQuery is to make it easier for developers to manipulate DOM elements without the need for cumbersome JavaScript code. By using jQuery, developers can use concise syntax to select, manipulate and modify HTML elements, such as selecting elements through selectors, modifying text content, adding styles, binding and triggering events, etc. This enables developers to implement interactive web page effects more quickly and improve user experience.
In addition to DOM operations, jQuery also provides a wealth of plug-ins for handling common development tasks. These plugins can be easily integrated into projects and provide many useful features such as date pickers, chart drawing, image carousels, and more. Developers can choose appropriate plug-ins based on project needs to achieve the required functions faster.
Another important feature is jQuery’s event handling mechanism. Through jQuery, developers can easily bind and trigger various events, such as clicks, mouse movements, keyboard input, etc. This allows developers to respond more flexibly to user interactions and implement rich user interfaces.
jQuery also provides powerful animation effects, allowing developers to create a variety of transitions and animation effects. Developers can use predefined animation effects, such as fade in and out, slide, expand and fold, etc., or customize animation effects. This allows developers to add vivid interactive effects to web pages and enhance users' experience of the website.
In addition, because jQuery is so popular, there is a wealth of documentation, tutorials, and community support available to developers. These resources can help developers better understand and use jQuery and solve problems encountered. At the same time, due to its wide application, many websites and applications use jQuery, which means that developers can more easily use and maintain existing code.
To sum up, jQuery is a powerful and concise JavaScript library, designed to simplify the development process and improve development efficiency. By providing a rich API and functional plug-ins, jQuery enables developers to more easily manipulate the DOM, handle events, create animation effects, etc. Its popularity and widespread use make it easier for developers to use and maintain existing code, while also being able to solve problems with abundant resources and community support. Both beginners and experienced developers can benefit from jQuery and apply it to their own projects.
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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。

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。

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。

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。

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。

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