index.html

<!DOCTYPE html>
<html>
<head>
  <title>Portfolio</title>
  <meta charset="utf-8">
  <link rel="stylesheet" href="css/styles.css">
  <link href="https://fonts.googleapis.com/earlyaccess/notosanskr.css" rel="stylesheet">
</head>
<body>
  <!-- navigation bar -->
  <div class="navbar">
    <img src="images/profile_img.png" width="34" height="34">
    <ul class="menu-right">
      <li><button id="about-btn">About</button>
      <li><button id="contact-btn">Contact</button>
    </ul>
  </div>

  <section class="header">
    <div class="helper"></div><div class="vertical-center">
      <h1>I'm an engineer</h1>
      <h2>FRONT-END DEVELOPER</h2>
    </div>
  </section>

  <!-- about me -->
  <section class="about">
    <div class="helper"></div><div class="vertical-center">
      <h3>About Me</h3>
      <p>안녕하세요. 저는 프론트엔드와 백엔드를 넘나드는 개발자입니다. 만나서 반가워요!</p>

      <div class="skillset">
        <div class="skill">
          <div class="title">HTML5</div>

          <div class="bar">
            <div class="inner-bar"></div>

            <span class="percentage">90%</span>
          </div>
        </div>

        <div class="skill">
          <div class="title">CSS3</div>

          <div class="bar">
            <div class="inner-bar"></div>

            <span class="percentage">90%</span>
          </div>
        </div>

        <div class="skill">
          <div class="title">jQuery</div>

          <div class="bar">
            <div class="inner-bar"></div>

            <span class="percentage">85%</span>
          </div>
        </div>

        <div class="skill">
          <div class="title">Python</div>

          <div class="bar">
            <div class="inner-bar"></div>

            <span class="percentage">75%</span>
          </div>
        </div>

        <div class="skill">
          <div class="title">Rails</div>

          <div class="bar">
            <div class="inner-bar"></div>

            <span class="percentage">70%</span>
          </div>
        </div>

        <div class="skill">
          <div class="title">Sketch</div>

          <div class="bar">
            <div class="inner-bar"></div>

            <span class="percentage">90%</span>
          </div>
        </div>
      </div>
    </div>
  </section>

  <!-- contact me -->
  <section class="contact">
    <div class="helper"></div><div class="vertical-center">
      <h3>Contact Me</h3>
      <p>언제든지 편하게 연락주세요. 감사합니다.</p>

      <form>
        <input type="text" name="name" placeholder="NAME">
        <input type="email" name="email" placeholder="EMAIL">
        <textarea type="text" name="message" placeholder="MESSAGE"></textarea>
      </form>
    </div>
  </section>
    
  <script
    src="https://code.jquery.com/jquery-3.2.1.min.js"
    integrity="sha256-hwg4gsxgFZhOsEEamdOYGBf13FyQuiTwlAQgxVSNgt4="
    crossorigin="anonymous"></script>
  <script src="js/script.js"></script>
</body>
</html>

css/styles.css

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: 'Noto Sans KR', sans-serif;
  min-width: 768px;
}

/* navbar */

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 60px;
  line-height: 60px;
  padding: 0 60px;
}

.navbar img {
  vertical-align: middle;
}

.navbar .menu-right {
  float: right;
  padding: 0;
  margin: 0;
  list-style: none;
}

.navbar .menu-right li {
  float: left;
}

.navbar .menu-right li button {
  color: white;
  font-size: 16px;
  font-weight: 300;
  text-decoration: none;
  transition: color 1s;
  padding: 0;
  background-color: transparent;
  border: none;
  outline: none;
  cursor: pointer;
}

.navbar .menu-right li:last-child {
  margin-left: 30px;
}

/* vertical center */

.helper {
  display: inline-block;
  height: 100%;
  vertical-align: middle;
}

.vertical-center {
  display: inline-block;
  vertical-align: middle;
  color: white;
  opacity: 0;
  position: relative;
  top: 100px;
}

/* header */

.header {
  background-image: url('../images/hero_background.jpg');
  background-size: cover;
  background-position: center center;
  height: 100vh;
  min-height: 600px;
  text-align: center;
}

.header h1 {
  font-size: 40px;
  margin: 0;
  margin-bottom: 33px;
}

.header h2 {
  font-size: 20px;
  margin: 0;
  font-weight: normal;
}

/* about */

.about {
  height: 100vh;
  min-height: 600px;
  text-align: center;
}

.about h3 {
  font-size: 40px;
  color: #4a4a4a;
  margin: 0;
  margin-bottom: 37px;
}

.about p {
  font-size: 16px;
  color: #4a4a4a;
  margin: 0;
  margin-bottom: 61px;
}

.about .skillset {
  display: inline-block;
}

.about .skill:not(:last-child) {
  margin-bottom: 17px;
}

.about .skill .title {
  display: inline-block;
  width: 50px;
  vertical-align: middle;
  margin-right: 15px;
  font-size: 16px;
  color: #4a4a4a;
}

.about .skill .bar {
  display: inline-block;
  vertical-align: middle;
  width: 646px;
  height: 33px;
  border-radius: 25px;
  background-color: #f9f9f9;
  position: relative;
  line-height: 33px;
}

.about .skill .bar .inner-bar {
  position: absolute;
  top: 0;
  left: 0;
  height: 33px;
  background: #bbe6ff;
  border-radius: 25px;
}

.about .skill .bar .percentage {
  font-size: 14px;
  color: #9b9b9b;
  position: absolute;
  right: 20px;
  top: 0;
}

/* contact */

.contact {
  height: 100vh;
  min-height: 600px;
  background-color: #f9f9f9;
  text-align: center;
}

.contact h3 {
  font-size: 40px;
  color: #4a4a4a;
  margin: 0;
  margin-bottom: 37px;
}

.contact p {
  font-size: 16px;
  color: #4a4a4a;
  margin: 0;
  margin-bottom: 61px;
}

.contact form {
  display: inline-block;
  vertical-align: middle;
  width: 646px;
}

.contact input,
.contact textarea {
  display: block;
  width: 100%;
  border-radius: 4px;
  border: solid 1px #ebebeb;
  font-size: 16px;
  padding: 10px 30px;
}

.contact input {
  margin-bottom: 24px;
}

.contact textarea {
  resize: none;
  height: 222px;
}

js/script.js

// 변수의 반복 선언을 줋이기 위해서 해당 클래스로 가는 함수에 
// 변수를 제거하고 함수 밖에 전역변수로 정의 하였습니다.
$(window).on('scroll', function(){
    
    //사용자의 스크롤 위치
    var windowHeight = $(window).scrollTop(); 
    console.log(windowHeight); 
    // y축의 위치가 메인화면을 벗어났을 때, about과 contact의 색이 바뀜(포트폴리오 pt.1)
    if(windowHeight >= 1093){
        $("#about-btn, #contact-btn").css("color","#4A4A4A");            
    }else{
        $("#about-btn, #contact-btn").css("color","#fff");            
    }
    
    // navbar의 about-btn 버튼을 클릭 하였을 때 해당위치로 가는 부분
    $('#about-btn').on('click', function(){    
        var about_srollTop = $('.about').offset().top;
        console.log(about_srollTop);
        $('html, body').animate({scrollTop: about_srollTop}, 1000);
    });

    // navbar의 contract-btn 버튼을 클릭 하였을 때 해당위치로 가는 부분
    $('#contact-btn').on('click', function(){
        var contact_srollTop = $('.contact').offset().top;
        console.log(contact_srollTop);
        $('html, body').animate({scrollTop: contact_srollTop}, 1000);
    });
});

안녕하세요.

자바스크립트에서 $(window).on('scroll', function(){...} 함수 안에 on('click') 함수를 선언하여 실행하면

온클릭함수가 잘 실행되지 않습니다. (참고로 on('click') 함수들을 바깥쪽으로 빼면 정상동작 합니다~)

위에 예와 같은 경우 $('#contact-btn').on('click', function(){...} 가 제대로 실행이 되지 않는데요.. 어떤 문제가 있는건지를 못찾겠네요 ㅜㅜ 디버깅하는 방법도 궁금합니다..!