Explore conversion between jQuery and JavaScript

With the widespread application of JavaScript technology in web pages, more and more JavaScript libraries and frameworks have emerged, among which jQuery is the most commonly used one. jQuery is one of the most widely used JavaScript libraries and has become one of the essential tools for web front-end engineers. This article explores converting between jQuery and JavaScript.

jQuery Introduction

jQuery is a powerful JavaScript library that simplifies the writing of JavaScript code and provides a set of easy-to-use APIs to process HTML documents, event processing, animation effects, etc. aspects of operations. The jQuery library has been widely used to build web applications, web sites, and various mobile applications.

With its slogan "Write Less, Do More" (Write Less, Do More), jQuery has quickly become the first choice for developers and web designers. It provides developers with many useful features and plug-ins, allowing them to quickly create dynamic websites and customize the website to suit a variety of needs.

Advantages of jQuery

• Simplifies code writing: The API provided in jQuery is simpler and easier to use than native JavaScript, avoiding a lot of repeated code.
• Reduces the burden on the browser: The writing method of jQuery code and its optimization plan can optimize the loading speed of the browser and reduce the resource usage of the browser.
• Cross-browser compatibility: jQuery has a consistent API that can maintain consistency in different browsers without worrying about browser compatibility issues.
• Rich plug-in library: The openness of jQuery enables it to be extended to various fields, and the rich plug-in library enables it to meet various needs.

The relationship between jQuery and JavaScript

jQuery is not a language, but an implementation of a JavaScript library. jQuery can be completely implemented using native JavaScript code, but jQuery provides a set of APIs that are optimized, simplified, and can be implemented across browsers, which can help us develop standards-compliant web pages faster.

From an investment perspective, jQuery can allow developers to spend more time on building applications, reduce investment in the development cycle, reduce the development risks of website applications, and at the same time obtain product results more quickly. customer feedback.

Converting from jQuery to JavaScript

Although jQuery has many advantages, there are some situations where you may want to do without jQuery. For example, the priority is the loading time of the website, and jQuery is a relatively large library. In this case, you can move to using native JavaScript to implement the code.

The following are some commonly used functions of jQuery, and the corresponding native JavaScript code implementation:

Document loading completion event

$(document).ready(function() {
  // jQuery code here
});

You can use the onload event of native JavaScript to complete the document loading completion Event

window.onload = function() {
  // pure JavaScript code here
};

Binding event

$("#btn").click(function() {
  // jQuery code here
});

You can use native JavaScript's addEventListener event to bind events

document.getElementById('btn').addEventListener('click', function() {
  // pure JavaScript code here
});

Get elements

var element = $(".my-element");

You can use native JavaScript's getElementById or querySelectorAll Get elements from the document

var element = document.getElementById('my-element');

or

var elements = document.querySelectorAll('.my-element');

Manipulate elements

$(".my-element").css("background-color", "red");

You can use the style attribute of native JavaScript to manipulate elements

var elements = document.querySelectorAll('.my-element');
for (var i = 0; i <h3 id="Ajax-Request">Ajax Request</h3><pre class="brush:php;toolbar:false">$.ajax({
  url: "url",
  data: data,
  type: "GET",
  dataType: "json",
  success: function(result) {
    console.log(result);
  },
  error: function(error) {
    console.log(error);
  }
});

You can use the XMLHttpRequest object of native JavaScript to implement Ajax request

var xhr = new XMLHttpRequest();
xhr.onreadystatechange = function() {
  if (xhr.readyState == 4 && xhr.status == 200) {
    console.log(xhr.responseText);
  } else {
    console.log(xhr.statusText);
  }
};
xhr.open("GET", "url");
xhr.send();

Summary

Whether you are using jQuery or native JavaScript, you need to choose the most suitable one based on the actual situation. A method that suits you. Although jQuery has many advantages, if your application needs to load within strict time constraints, or your application only needs simple animations and operations, you may consider using native JavaScript. No matter which method you choose, you need to continuously improve your skills through continuous learning and practice, and continuously improve your technical level in an ever-improving development environment.

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