JQuery code
/* Open the link in a new window: JQuery filter attr
* Disable the mouse to pop up the right-click menu: DOM contextmenu
* Return to the top of the page: DOM scrollTo
* Dynamically replace the CSS style sheet: JQuery filter Element Attribute
* Adjust the page Font size: Css html.css parseFloat
*/
//Confirm that DOM loading is complete
$(document).ready(function () {
/* Links with href attributes starting with http will open the link in a new window* /
// ^ Filter, attribute: start with a specific string
$("a[href ^='http']").attr("target", "_blank");
/* Disable right mouse button* /
//DOM contextmenu is the right-click menu of the mouse
$(document).bind("contextmenu", function (e) {
alert(("No right-clicking!"));
//Do not execute downward, In other words, the right-click menu does not appear
return false;
});
/* Return to the top of the page*/
//The click event of the element with id="top" is triggered
$('#top').click( function () {
// Return to the top of the page
$(document).scrollTo(0, 500);
});
use using the href of the page link ’s css style sheet to dynamically change the page The value replaces the href attribute value of the link tag
$("a.cssSwap").click(function(){
$("link[rel=stylesheet]").attr("href",$(this) .attr("rel"));
});
/* Enlarge, reduce, and restore page font size*/
//Get the font size, font-size is defined under the html tag
var originalFontSize = $ ("html").css("font-size");
//Restore default font size
$(".resetFont").click(function () {
$("html").css("font- size", originalFontSize);
using using using ‐ ‐ through use using ’ ’s' out of ward over ’s ’ s size', originalFontSize-- . () {
using suffix using px, pt, pc
through ’ ’ ’ s suffix through using parseFloat's'‐' ‐ ‐ taken to, Type remove suffix
var currentFontSizeNumber = parseFloat(currentFontSize);
//Newly defined font size
var newFontSize = currentFontSizeNumber * 1.1;
html").css("font-size" , newFontSize);
using using using through ‐ ’ ’ s downward ‐ ‐ ‐‐‐‐ , newFontSize);
{得 // Get the current font size suffix PX, PT, pc
varcurrentfontsize = $ ("html"). Css ("font-size"); Suffix
var currentFontSizeNumber = parseFloat(currentFontSize);
//Redefine font size
var newFontSize = currentFontSizeNumber * 0.9; use using use using using using using using using using out out out out out out out out out out out out out out out out of’s .css("font-size", newFontSize) ;
- Default style sheet-->

Yes, the engine core of JavaScript is written in C. 1) The C language provides efficient performance and underlying control, which is suitable for the development of JavaScript engine. 2) Taking the V8 engine as an example, its core is written in C, combining the efficiency and object-oriented characteristics of C. 3) The working principle of the JavaScript engine includes parsing, compiling and execution, and the C language plays a key role in these processes.

JavaScript is at the heart of modern websites because it enhances the interactivity and dynamicity of web pages. 1) It allows to change content without refreshing the page, 2) manipulate web pages through DOMAPI, 3) support complex interactive effects such as animation and drag-and-drop, 4) optimize performance and best practices to improve user experience.

C and JavaScript achieve interoperability through WebAssembly. 1) C code is compiled into WebAssembly module and introduced into JavaScript environment to enhance computing power. 2) In game development, C handles physics engines and graphics rendering, and JavaScript is responsible for game logic and user interface.

JavaScript is widely used in websites, mobile applications, desktop applications and server-side programming. 1) In website development, JavaScript operates DOM together with HTML and CSS to achieve dynamic effects and supports frameworks such as jQuery and React. 2) Through ReactNative and Ionic, JavaScript is used to develop cross-platform mobile applications. 3) The Electron framework enables JavaScript to build desktop applications. 4) Node.js allows JavaScript to run on the server side and supports high concurrent requests.

Python is more suitable for data science and automation, while JavaScript is more suitable for front-end and full-stack development. 1. Python performs well in data science and machine learning, using libraries such as NumPy and Pandas for data processing and modeling. 2. Python is concise and efficient in automation and scripting. 3. JavaScript is indispensable in front-end development and is used to build dynamic web pages and single-page applications. 4. JavaScript plays a role in back-end development through Node.js and supports full-stack development.

C and C play a vital role in the JavaScript engine, mainly used to implement interpreters and JIT compilers. 1) C is used to parse JavaScript source code and generate an abstract syntax tree. 2) C is responsible for generating and executing bytecode. 3) C implements the JIT compiler, optimizes and compiles hot-spot code at runtime, and significantly improves the execution efficiency of JavaScript.

JavaScript's application in the real world includes front-end and back-end development. 1) Display front-end applications by building a TODO list application, involving DOM operations and event processing. 2) Build RESTfulAPI through Node.js and Express to demonstrate back-end applications.

The main uses of JavaScript in web development include client interaction, form verification and asynchronous communication. 1) Dynamic content update and user interaction through DOM operations; 2) Client verification is carried out before the user submits data to improve the user experience; 3) Refreshless communication with the server is achieved through AJAX technology.


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