JS Onclick

 

    <script>
        window.onload=function(){
        document.getElementById("btn").onclick=function(){
      //다큐멘트에, 가져온다     btn버튼 클릭했을때 = 기능실행
      
       //1번째 방법
          let a=         document.frm.jumsu.value;  //문자형
          let a=parseInt(document.frm.jumsu.value); //숫자형
       //2번째방법
          let b=         document.getElementById("jumsu").value; //문자형
          let b=parseInt(document.getElementById("jumsu").value); //숫자형
            console.log(b);
            console.log(typeof b);
            }
        }
    
    </script>
 
 
    <form name="frm">
       <label for="jumsu">점수</label>
       <input type="text" name="jumsu" id="jumsu">
       <br>
       <input type="button" id="btn" value="결과보기">
                
    </form>