JQuery is another excellent Javascript library after prototype. It is a lightweight js library that is compatible with CSS3 and various browsers (IE 6.0+, FF 1.5+, Safari 2.0+, Opera 9.0+). jQuery2.0 and subsequent versions will no longer support IE6/7 /8 browser. jQuery enables users to more easily process HTML (an application under Standard Universal Markup Language), events, implement animation effects, and easily provide AJAX interaction for websites. Another big advantage of jQuery is that its documentation is very complete and its various applications are explained in detail. There are also many mature plug-ins to choose from. "Black Horse Cloud Classroom jQuery Basics Video Tutorial" can keep the code and HTML content of the user's HTML page separated. In other words, there is no need to insert a bunch of js in the HTML to call commands, and only need to define the id.