javascript-basic/3-03.DefaultFunctionParameter.html at main · seungwongo/javascript-basic · GitHub

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<!DOCTYPE html>
<html>
<head>
  <title>Document</title>
</head>
<body>
  <script>
    // function say(message) {
    //   console.log(message);
    // }

    // function say(message) {
    //   if(message != undefined) {
    //     console.log(message);
    //   }else {
    //     console.log("파라미터가 넘어오지 않았어요.");
    //   }
    // }

    function say(message="파라미터가 넘어오지 않았어요") {
      console.log(message);
    }

    function plus(x, y=1){
      console.log(x+y);
    }

    plus(4,2);

    say("안녕하세요");
    say();


    //ES6 - EcmaScript 6버전
    //

  </script>
</body>
</html>