jquery object uses js method

jQuery is a very popular Javascript library that can easily operate the HTML Document Object Model (DOM) to achieve dynamic effects and user interaction. When using jQuery, we usually operate on jQuery objects, which are wrappers for selected HTML elements. However, in some cases, we need to use some traditional Javascript methods to handle these jQuery objects. This article will explain how to use Javascript methods in jQuery, as well as the advantages and disadvantages of doing so.

1. jQuery object and DOM element object

Before we start to introduce how to use Javascript methods in jQuery, we need to first understand the difference between jQuery object and DOM element object.

When we use the jQuery selector to select one or more HTML elements, the result is a jQuery object that wraps these HTML elements. This object has many methods and properties that can perform various operations. For example, we can use jQuery's css method to change the CSS style of the selected element, use the animate method to achieve animation effects, use the click method to bind events, and so on.

The DOM element object is the representation of HTML elements in Javascript. When we need to use Javascript to operate on HTML elements, we need to convert jQuery objects into DOM element objects. This can be accomplished using the jQuery object's get method or array subscripting. For example, $("#myElement").get(0) or $("#myElement")[0] can get the DOM object representing the element.

2. Using Javascript methods in jQuery

Sometimes, we will find that using jQuery methods cannot meet our needs, or some operations are more complicated, and it will be more difficult to use native Javascript methods. Convenient and efficient. At this time, we can use Javascript methods in jQuery to process HTML elements.

1. Select DOM elements

When we need to use Javascript methods to read or modify the attributes or text content of an element, we need to first convert the jQuery object into a DOM element object. For example, the following code will get the value attribute of the input box and print it to the console.

var input = $(“#myInput”).get(0);
console.log(input.value);

2. Creating new elements

Sometimes, we need to dynamically create new HTML elements and add them to the document. This can be done using the jQuery object's append or after methods, or using Javascript's createElement and appendChild methods. The difference between the two methods is that using the jQuery method will return the new element in the form of a jQuery object, and you can continue to use jQuery methods to operate on the new element, while using the Javascript method requires converting the new element into a jQuery object first.

For example, the following code will create a new div element and add it to the end of the body element.

// 使用jQuery方法
var newDiv = $(“<div></div>”);
$(“body”).append(newDiv);

// 使用Javascript方法
var newDiv = document.createElement(“div”);
document.body.appendChild(newDiv);
$(newDiv).addClass(“myClass”);

3. Binding events

Another situation where native Javascript methods are often needed is event handlers. Although jQuery objects have their own event binding methods (such as click, mouseover, etc.), sometimes we need to use the addEventListener or attachEvent method to achieve more flexible event binding. For example, to bind a custom click event handler to a button, the code is as follows.

// 使用jQuery方法
$(“#myButton”).click(function() {
    alert(“clicked!”);
});

// 使用Javascript方法
var myButton = $(“#myButton”).get(0);
myButton.addEventListener(“myEvent”, function() {
    alert(“clicked!”);
});

3. Advantages and Disadvantages of Using Javascript Methods

There are advantages and disadvantages of using Javascript methods in jQuery. The advantage is that native Javascript methods are usually more flexible and efficient than jQuery methods, can implement more complex operations, and are also compatible with other Javascript libraries or frameworks. For example, if you need to integrate with React components or use advanced features such as WebSocket, you often need to use native Javascript methods.

The disadvantage is that using Javascript methods may destroy the maintainability and readability of the code. Because jQuery's methods have encapsulated a large number of commonly used operations for us, frequent use of native Javascript methods may cause the code to become redundant and complex, reducing the readability and maintainability of the code. In addition, when using Javascript methods, you need to consider issues such as compatibility and cross-browser support, and you need to be more careful.

In summary, although using Javascript methods in jQuery can easily achieve more flexible and efficient operations, it requires extra effort in maintaining code readability and compatibility. In actual development, you should choose whether to use native Javascript methods based on specific circumstances, and how to balance the relationship between maintainability and performance.

The above is the detailed content of jquery object uses js method. For more information, please follow other related articles on the PHP Chinese website!