Introduction to the use of jquery events and functions_jquery
Method 1:
Use this method to add events to elements when the page loads
$("#myElement").click(function(){
alert($(this). text());
})
Method 2:
Same as 1, you can also add events to elements after the page is loaded, such as creating new DOM elements
$("#myElement").bing('click' ,function(){
alert($(this).text());
})
2. Function declaration and named function expression
Function declaration:
function myFun1() {
$("div").hide();
}
Call: myFun1();
Function expression:
var myFun2 = function(){
$("div").hide ();
}
Call: #("#myElement").click(myFun2);
Difference: The difference in calling time, Function declarations can be used anywhere, named function expressions can only be used after declaration

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Default parameters in C++ provide the ability to specify default values for function parameters, thereby enhancing code readability, simplicity, and flexibility. Declare default parameters: Add the "=" symbol after the parameter in the function declaration, followed by the default value. Usage: When the function is called, if optional parameters are not provided, the default values will be used. Practical case: A function that calculates the sum of two numbers. One parameter is required and the other is optional and has a default value of 0. Advantages: Enhanced readability, increased flexibility, reduced boilerplate code. Note: It can only be specified in the declaration, it must be at the end, and the types must be compatible.

In C++, the order of function declarations and definitions affects the compilation and linking process. The most common is that the declaration comes first and the definition comes after; you can also use "forwarddeclaration" to place the definition before the declaration; if both exist at the same time, the compiler will ignore the declaration and only use the definition.

A function declaration informs the compiler of the existence of the function and does not contain the implementation, which is used for type checking. The function definition provides the actual implementation, including the function body. Key distinguishing features include: purpose, location, role. Understanding the differences is crucial to writing efficient and maintainable C++ code.

Function declaration and definition are necessary in C++. Function declaration specifies the return type, name and parameters of the function, while function definition contains the function body and implementation. First declare the function and then use it in your program passing the required parameters. Use the return statement to return a value from a function.

jQuery is a widely used JavaScript library used to simplify DOM manipulation, event handling, animation effects and other operations on web pages. In web development, it is often necessary to bind events to page elements, and binding select option change events is one of the common requirements. This article will introduce how to use jQuery to bind select option change events and provide specific code examples. 1. Introduce the jQuery library first, in the HTML document

C++ compilation error: function call does not match function declaration, how to solve it? When developing C++ programs, you will inevitably encounter some compilation errors. One of the common errors is that the function call does not match the function declaration. This kind of error widely exists among C++ programmers. Due to not paying attention to the correctness of function declaration, it leads to compilation problems, which ultimately wastes time and energy to fix the problem and affects development efficiency. Ways to avoid this mistake require following some norms and standard practices, let’s take a look at them below. What is a function call versus a function declaration?
![[[nodiscard]] in C++ function declarations: Demystifying the consequences of ignoring return values](https://img.php.cn/upload/article/000/465/014/171455868319393.jpg?x-oss-process=image/resize,m_fill,h_207,w_330)
The [[nodiscard]] attribute indicates that the return value of the function must not be ignored, otherwise it will cause a compiler warning or error to prevent the following consequences: uninitialized exceptions, memory leaks, and incorrect calculation results.

The C++ function declaration syntax is: returnTypefunctionName(parameterType1parameterName1,...,parameterTypeNparameterNameN);, where returnType is the return type, functionName is the function name, parameterType is the parameter type, and parameterName is the parameter name, which must end with a semicolon.
