Note
JS code:
/////////////////// ///////////////////////////////////////////////////// ///////////////
// CONFIGURATION
/////////////////////////// ///////////////////////////////////////////////////// ////////
// Main background color (large area)
// Usually use bright colors (light yellow, etc...)
if (typeof fcolor == 'undefined') { var fcolor = "ffffff";}
// Border color and title bar color;
// Usually dark color (brown, black, etc.)
if (typeof backcolor == 'undefined') { var backcolor = "#FF9900";}
// The color of the text
// Usually a darker color;
if ( typeof textcolor == 'undefined') { var textcolor = "#000000";}
// The color of the title
// Usually a bright color;
if (typeof capcolor == ' undefined') { var capcolor = "#FFFFFF";}
// The color of "Close"
// Usually a bright color;
if (typeof closecolor == 'undefined') { var closecolor = "#9999FF";}
// The width of the pop-up window;
// 100-300 pixels is appropriate
if (typeof width == 'undefined') { var width = "280";}
//The width of the edge, in pixels.
// 1-3 pixels suitable
if (typeof border == 'undefined') { var border ="2";}
// The pop-up window is located on the left side of the mouse or Distance to the right, in pixels.
// 3-12 is suitable
if (typeof offsetx == 'undefined') { var offsetx = 10;}
// The distance between the pop-up window and the mouse;
// 3-12 Suitable
if (typeof offsety == 'undefined') { var offsety = 10;}
/////////////////// ///////////////////////////////////////////////////// //////////////
// End of setup
/////////////////////////// ///////////////////////////////////////////////////// ////////
ns4 = (document.layers)? true:false
ie4 = (document.all)? true:false
// Microsoft Stupidity Check .
if (ie4) {
if (navigator.userAgent.indexOf('MSIE 5')>0) {
ie5 = true;
} else {
ie5 = false; }
} else {
ie5 = false;
}
var x = 0;
var y = 0;
var snow = 0;
var sw = 0;
var cnt = 0;
var dir = 1;
var tr=1; = document.overDiv
if (ie4) over = overDiv.style
document.onmousemove = mouseMove
if (ns4) document.captureEvents(Event.MOUSEMOVE)
}
/ / The following are the public functions used in the page;
// Simple popup right
function drs(text) {
dts(1,text);
}
// Clears popups if appropriate
function nd() {
if ( cnt >= 1 ) { sw = 0 };
if ( (ns4) || (ie4) ) {
if ( sw == 0 ) {
snow = 0;
hideObject(over);
} else {
cnt ;
}
}
}
// Non-public function, called by other functions;
// Simple popup
function dts(d,text) {
txt = "
|
layerWrite(txt);
dir = d;
disp();
}
// Common calls
function disp() {
if ( (ns4) || (ie4) ) {
if (snow == 0) {
if (dir == 2) { // Center
moveTo(over,x offsetx-(width/2),y offsety);
}
if (dir == 1) { // Right
moveTo(over,x offsetx,y offsety);
}
if (dir == 0) { // Left
moveTo(over,x-offsetx-width,y offsety);
}
showObject(over);
snow = 1;
}
}
// Here you can make the text goto the statusbar.
}
// Moves the layer
function mouseMove(e) {
if (ns4) {x=e.pageX; y=e.pageY;}
if (ie4) {x=event.x document. body.scrollLeft; y=event.y document.body.scrollTop;}
if (ie5) {x=event.x document.body.scrollLeft; y=event.y document.body.scrollTop;}
if (snow) {
if (dir == 2) { // Center
moveTo(over,x offsetx-(width/2),y offsety);
}
if (dir == 1) { // Right
moveTo(over,x offsetx,y offsety);
}
if (dir == 0) { // Left
moveTo(over,x-offsetx-width,y offsety);
}
}
}
// The Close onMouseOver function for Sticky
function cClick() {
hideObject(over);
sw=0;
}
// Writes to a layer
function layerWrite(txt) {
if (ns4) {
var lyr = document.overDiv.document
lyr.write(txt)
lyr.close()
}
else if (ie4) document.all["overDiv"].innerHTML = txt
if (tr) { }
}
// Make an object visible
function showObject(obj) {
if (ns4) obj.visibility = "show"
else if (ie4) obj.visibility = "visible"
}
// Hides an object
function hideObject(obj) {
if (ns4) obj.visibility = "hide"
else if (ie4) obj.visibility = "hidden"
}
// Move a layer
function moveTo(obj,xL,yL) {
obj.left = xL
obj.top = yL
}

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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