What does dot mean in jquery

jQuery is a popular JavaScript library that has become the core of modern web development, allowing developers to more easily manipulate HTML documents, as well as dynamically update pages and interactive effects. In jQuery, the concept of "point" is often involved, so what does this point mean?

In jQuery, dots are usually used to access or manipulate the properties and methods of objects. An object refers to any variable or value defined in JavaScript, including arrays, functions, DOM elements, etc. For example, we can use dot notation to get the text content of a DOM element:

var text = $('p').text(); // 获取第一个 <p> 元素的文本内容

In this example, $ is an alias for the jQuery function, which is similar to document.querySelector() and is used to select DOM elements. It returns a jQuery object, and we can use dot notation to access its text() method, which is used to get the text content.

Another example is to sort an array:

var fruits = ['apple', 'orange', 'banana'];
fruits.sort(); // 使用点符号调用sort()方法对数组进行排序

In this example, we use dot notation to call the sort() method of the array, which is used to sort the array in alphabetical order. Sort.

In addition to accessing properties and methods, dot notation can also be used for chain call operations. For example, in the following example, we select a form element, and then use dot notation to call its parent() method and addClass() method:

$('form input').parent().addClass('highlight');

In this example, we use the selector to select a form element, and its parent() method is accessed using dot notation, which returns the parent element of the element. We then called the addClass() method using dot notation, which adds a CSS class name that changes the background color of the parent element to yellow.

In general, the dot notation plays a very important role in jQuery. It is the key to accessing and manipulating objects. Understanding how to use dot notation can help us better understand and write jQuery code.

The above is the detailed content of What does dot mean in jquery. For more information, please follow other related articles on the PHP Chinese website!