Decrypting the two major categories of jQuery library
jQuery is a popular JavaScript library that is widely used in web development. It simplifies the writing of JavaScript code and Provides rich functions and plug-ins. When using jQuery, we often encounter two major categories of functions: DOM manipulation and event handling. This article explains in detail what these two categories do and provides specific code examples.
1. DOM operation
DOM operation is an important feature of the jQuery library, which allows us to easily obtain, operate and modify HTML elements in web pages through selectors. The following are several commonly used DOM operation methods:
// 通过ID选择器获取元素 var element = $("#myElement"); // 通过类选择器获取元素 var elements = $(".myClass"); // 通过属性选择器获取元素 var elements = $("input[type='text']");
// 修改元素文本 $("#myElement").text("Hello, jQuery!"); // 添加样式 $("#myElement").css("color", "red"); // 设置属性 $("#myElement").attr("data-id", 123);
// 添加元素 $("#container").append("<div>New element</div>"); // 删除元素 $("#elementToDelete").remove(); // 移动元素 $("#elementToMove").appendTo("#newContainer");
2. Event processing
Another important function is event processing. jQuery provides a wealth of event processing methods, allowing us to easily respond to user interactions. response. The following are several commonly used event handling methods:
// 点击事件 $("#myButton").click(function(){ alert("Button clicked!"); }); // 悬停事件 $("#myElement").hover(function(){ alert("Mouse over!"); }, function(){ alert("Mouse out!"); });
// 事件委托 $("#container").on("click", ".dynamicElement", function(){ alert("Dynamic element clicked!"); });
// 阻止事件冒泡 $("#myLink").click(function(event){ event.stopPropagation(); }); // 阻止默认行为 $("#myForm").submit(function(event){ event.preventDefault(); });
Summary:
Through this article’s decryption of the two major categories of the jQuery library—DOM operations and event processing, we can better understand the powerful functions and application scenarios of jQuery . In actual development, mastering these two types of functions and flexibly using the methods can greatly improve the efficiency and quality of web development. I hope this article can be helpful to readers, and you are welcome to continue to explore more exciting functions of the jQuery library in practice!
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