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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

HTML

            
              <div class="wrapper">
<ul class="price_wrapper">
  <li class="origin_price">소비자가 : 50,000원</li>
  <li class="sale_price">판매가 : 35,000원</li>
</ul>
  </div>
            
          
!

CSS

            
              .wrapper{
  display:flex;
  justify-content:center;
  align-items:center;
  width:100vw;
  height:100vh;
  background-color:#41da8c;
  
}
.price_wrapper{
  list-style:none;
  padding: 2rem;
  background:#fff;
  border-radius:4px;  
  box-shadow:0px 3px 3px rgba(0,0,0,0.4);
  li{
    text-align:left;
    margin-bottom:0.5rem;
    .sale_percent{
      background-color:#ff4a21;
      padding:0.5rem 0.75rem;
      margin-left:1rem;
      color:#fff;
      border-radius:30px;
      font-weight:bold;
      font-size:0.725rem;      
    }    
  }
  .origin_price{
      font-size:0.875rem;
      color:#adadad;
      text-decoration:line-through;
    }
  .sale_price{
    font-weight:bold;
  }
  
}
            
          
!

JS

            
              function discountPercent() {
    var originPrice = document.querySelector('.origin_price');
    var discountPrice = document.querySelector('.sale_price');
  
    /**
     * originPrice가 undefined와 Null값이 아닐 경우에만 
     * 스크립트가 실행되도록 조건 설정
     */

    if (originPrice != undefined && originPrice != null) {

        // 소비자가에서 문자열('원') 삭제 
        originPrice = originPrice.textContent.replace(/\D+/g, '');
        // 판매가에서 문자열('원') 삭제
        discountPrice = discountPrice.textContent.replace(/\D+/g, '');

        
        /** 
         * originPrice 가 0원일 경우 '-infinity원'으로 출력되는 문제가 발생 
         * originprice 가 0이 아닐 경우에만 계산하도록 조건 설정         
         * */
        if (originPrice != 0) {
            // 퍼센티지 계산 후 소수점 아래 버림 
            var salePoint = 100 - (Math.floor(discountPrice / originPrice * 100));

            // span 노드 생성
            var salePercent = document.createElement('span');

            // 생성된 span 노드에 xx% 형식으로 문자열 생성
            salePercent.textContent = salePoint + '% 할인';

            // sale__percent 클래스 지정
            salePercent.classList.add('sale_percent');
            
            // 삽입할 위치 지정
            document.querySelector('.price_wrapper li:last-child').append(salePercent);
        }
    }
}
discountPercent();
            
          
!
999px

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