"" 타입변환
<p id="demo"></p> <script> var x = ""; document.getElementById("demo").innerHTML = "Number : " + Number(x) + "<br>" + "String : " + String(x) + "<br>" + "Boolean: " + Boolean(x); </script> 결과보기
<p id="demo"></p>
<script>
var x = "";
document.getElementById("demo").innerHTML =
"Number : " + Number(x) + "<br>" +
"String : " + String(x) + "<br>" +
"Boolean: " + Boolean(x);
</script>
결과보기
결과값:
Number : 0
String :
Boolean: false
주의: 따옴표 사이에 공백이 한 칸 존재하면, 참거짓 값이 true 찍힘.
<p id="demo"></p> <script> var x = " "; document.getElementById("demo").innerHTML = "Number : " + Number(x) + "<br>" + "String : " + String(x) + "<br>" + "Boolean: " + Boolean(x); </script> 결과보기
var x = " ";
Boolean: true