Web Front-end
JS Tutorial
Methods of declaring functions in JavaScript and return values of calling functions_Basic knowledge
Methods of declaring functions in JavaScript and return values of calling functions_Basic knowledge
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title></title>
<!--js中声明函数的方法-->
<script type="text/javascript">
//因为javascript是弱类型的语言，所以参数不需要加类型。函数的也不需要像c#那样要求所以路径都需要有返回值（这个不像c#语言，而且c#的方法也不需要在方法名前面在 function关键字）
function add(i, j) { //现在只是声明了一个函数在这里，只有调用到它的时候它才会被执行。
return i + j;
}
alert(add(5, 6)); //输出11
//js中并非所有路径都有返回值，如果没有返回值他就认为返回值是undefined
function sum(x, y) {
if (x > y) {
alert(x + y);
}
}
var z = sum(2, 6); //因为2并不大于6所以sum函数就没有返回值。如果没有返回值他就认为返回值是undefined。
alert(z); //所以它就输出了undefined
</script>
</head>
<body>
</body>
</html>
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
AI Hentai Generator
Generate AI Hentai for free.
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
Default parameters in C++ function declarations: a comprehensive analysis of their declaration and usage
May 02, 2024 pm 03:09 PM
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.
Three ways to get thread return value in Python
Apr 13, 2023 am 10:43 AM
When it comes to threads, your brain should have this impression: we can control when it starts, but we cannot control when it ends. So how do we get the return value of the thread? Today I will share some of my own practices. Method 1: Use a list of global variables to save the return value ret_values = [] def thread_func(*args): ... value = ... ret_values.append(value) One reason to choose a list is: the append() of the list Methods are thread-safe, and in CPython, the GIL prevents concurrent access to them. If you use a custom data structure, and
How to solve the problem that scanf return value is ignored
Nov 14, 2023 am 10:01 AM
Solutions to the ignored return value of scanf include checking the return value of scanf, clearing the input buffer, and using fgets instead of scanf. Detailed introduction: 1. Check the return value of scanf. You should always check the return value of the scanf function. The return value of the scanf function is the number of successfully read parameters. If the return value is inconsistent with the expected one, it means that the input is incorrect; 2 , Clear the input buffer. When using the scanf function, if the input data does not match the expected format, the data in the input buffer will be lost, etc.
What impact does the order of declaration and definition of C++ functions have?
Apr 19, 2024 pm 01:42 PM
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.
Use Java's Math.min() function to compare the size of two numbers and return the smaller value
Jul 25, 2023 pm 01:21 PM
Use Java's Math.min() function to compare the sizes of two numerical values and return the smaller value. When developing Java applications, sometimes we need to compare the sizes of two numerical values and return the smaller number. Java provides the Math.min() function to implement this function. The Math.min() function is a static method of the JavaMath class. It is used to compare the size of two values and return the smaller number. Its syntax is as follows: publicstaticintmi
What is the difference between C++ function declaration and definition?
Apr 18, 2024 pm 04:03 PM
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.
Can a Golang function return multiple values?
Apr 13, 2024 pm 02:42 PM
Yes, Go functions can return multiple values by returning a tuple, which is an immutable value that can contain different types of data.
C++ function pointer as function return value
Apr 14, 2024 am 08:30 AM
Function pointers can be used as function return values, allowing us to determine at runtime which function to call. The syntax is: returntype(*function_name)(param1,param2,...). Advantages include dynamic binding and a callback mechanism that allow us to adjust function calls as needed.
