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What are the keywords used to define methods in javascript

藏色散人
Release： 2023-01-05 16:14:21
Original
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The keyword for defining methods in JavaScript is function; the syntax for using the function keyword is such as "function functionName(parameters) {executed code}".

What are the keywords used to define methods in javascript

The operating environment of this article: windows7 system, javascript version 1.8.5, Dell G3 computer.

JavaScript function definition

JavaScript uses the keyword function to define functions.

A function can be defined through a declaration or an expression.

Function declaration

In the previous tutorial, you have already understood the syntax of function declaration:

function functionName(parameters) {
  执行的代码
}
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The function will not be executed immediately after it is declared, but will be executed when we need it Called to.

Example

<!DOCTYPE html>
<html>
<head> 
<meta charset="utf-8"> 
<title></title> 
</head>
<body>

<p>本例调用的函数会执行一个计算，然后返回结果：</p>
<p id="demo"></p>
<script>
function myFunction(a,b){
	return a*b;
}
document.getElementById("demo").innerHTML=myFunction(4,3);
</script>

</body>
</html>
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Output: 

本例调用的函数会执行一个计算，然后返回结果：
12
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Recommended study: "javascript Advanced Tutorial"

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