JS函数表示

<!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>