The difference between js and jquery in obtaining dom objects

JavaScript is a programming language used to create interactive websites, which provides the ability to manipulate text, images, and other web page elements. jQuery is a JavaScript library that provides a concise way to handle DOM elements and other common web tasks, making it more convenient and easier to use than native JavaScript.

In web development, we often need to get elements from documents and modify their attributes, styles or content. In JavaScript, DOM elements can be obtained using methods such as getElementById() and getElementsByClassName(). In jQuery, you can use the $() function to quickly select specified elements.

The DOM object is obtained through the JavaScript native interface, which is suitable for native JS development. jQuery simply encapsulates the acquisition of DOM objects to improve efficiency and code simplicity.

When using native JavaScript to obtain DOM elements, you usually need to use the method of the document object, for example:

// 通过id获取元素
var elem = document.getElementById('myElement');

// 通过类名获取元素
var elems = document.getElementsByClassName('myClass');

This method is relatively cumbersome, and you often need to write more when dealing with complex tasks. code. Using jQuery to obtain DOM elements is more direct:

// 通过id获取元素
var elem = $('#myElement');

// 通过类名获取元素
var elems = $('.myClass');

As you can see, jQuery uses simple and direct symbols, abbreviating the method of obtaining DOM elements as the $() function. This approach is not only more intuitive and easier to understand, but also improves code efficiency and maintainability.

In addition, jQuery also provides a large number of convenient methods to modify element attributes, styles, content, etc. For example:

// 修改元素文本内容
$('#myElement').text('Hello World');

// 修改元素属性
$('a').attr('href', 'https://www.example.com');

// 修改元素样式
$('.myClass').css('color', 'red');

These methods can also be used in conjunction with event processing functions to achieve more flexible interactive effects.

In general, native JavaScript and jQuery have their own advantages and disadvantages in obtaining DOM objects. If the development task is relatively simple, you only need to obtain a small number of DOM elements to perform some simple operations, or you need to implement the processing logic of DOM elements by yourself, you can also get a better experience by using native JavaScript. In complex web development tasks, a large number of DOM elements are often required to be manipulated. Using jQuery can provide more convenient methods, more efficient code and better architecture.

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