The keyword for defining methods in JavaScript is function; the syntax for using the function keyword is such as "function functionName(parameters) {executed code}".
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
}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>Output:
本例调用的函数会执行一个计算，然后返回结果： 12
Recommended study: "javascript Advanced Tutorial"
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