html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>JS-函数</title>
</head>
<body>
</body>
<script>
//定义函数-1
/* function add(a,b){
return a+b;
} */
//定义函数-2
var add=function(a,b){
return a+b;
}
//函数调用
var result=add(10,20)
alert(result);
</script>
</html>