Javascript basic tutorial function

Javascript What is a function?

A function is a set of statements that perform a specific function. Without functions, it might take five, ten, or more lines of code to complete the task. At this time, we can put the code block that performs a specific function into a function and call this function directly, saving the trouble of repeatedly entering a large amount of code.

How to define a function

function function name(){

Function code segment;

}

Note:

#1. function is the keyword that defines the function.

2. "Function name" is the name you give the function.

3. Replace "function code" with a code that completes a specific function

Let's write an example below, the following code:

<!DOCTYPE html>
<html>
<head>
	<meta charset="utf-8">
	<title>函数</title>
	<script type="text/javascript">
			function sum(){
				var a=10;
				var b=5;
				var c= a+b;
				document.write(c);
			}
	</script>
</head>
<body>

</body>
</html>

As with the above code, we write functions one by one , the function of the function is to find the sum of a+b. Now how do we use the function?

How to call the function

Syntax: function name();

So in the example we wrote above, how should we output the function, as follows:

<!DOCTYPE html>
<html>
<head>
	<meta charset="utf-8">
	<title>函数</title>
	<script type="text/javascript">
			function sum(){
				var a=10;
				var b=5;
				var c= a+b;
				document.write(c);
			}

			sum();
	</script>
</head>
<body>

</body>
</html>

In this way we can call the function, and the output result is 15;

Continuing Learning

new file

<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>函数</title> <script type="text/javascript"> function sum(){ var a=10; var b=5; var c= a+b; document.write(c); } sum(); </script> </head> <body> </body> </html>

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Javascript basic tutorial function

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