2016. 11. 17. (Thu)
L15JavaScript
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Number Functions</title>
</head>
<body>
<h1>Number 데이터 타입을 다루자</h1>
<hr/>
<script>
var x = true;
document.write("<h3>x : "+x+"</h3>");
document.write("<h3>Number(x) : "+Number(x)+"</h3>");
x =false;
document.write("<h3>x : "+x+"</h3>");
document.write("<h3>Number(x) : "+Number(x)+"</h3>");
x = "100"; //Integer.parseInt("100"); -> Number("100");
document.write("<h3>x : "+x+"</h3>");
document.write("<h3>typeof Number(x) : "+typeof Number(x)+"</h3>");
x = "10 20"; //Integer.parseInt("100"); -> Number("100");
document.write("<h3>x : "+x+"</h3>");
document.write("<h3>Number(x) : "+Number(x)+"</h3>");
//NaN -> Not-a-Number 넘버 포맷의 오류가 발생되면 대입되는 값.
document.write("<hr/>");
x = "10.3333";
document.write("<h3>x : "+x+"</h3>");
document.write("<h3>parseInt(x) : "+parseInt(x)+"</h3><p>->정수로 반환</p>");
x = "10 20";
document.write("<h3>x : "+x+"</h3>");
document.write("<h3>parseInt(x) : "+parseInt(x)+"</h3>");
x = "10 aa";
document.write("<h3>x : "+x+"</h3>");
document.write("<h3>parseInt(x) : "+parseInt(x)+"</h3>");
x = "aa 10";
document.write("<h3>x : "+x+"</h3>");
document.write("<h3>parseFloat(x) : "+parseFloat(x)+"</h3>");
document.write("<hr/>");
x = "10.3333";
document.write("<h3>x : "+x+"</h3>");
document.write("<h3>parseFloat(x) : "+parseFloat(x)+"</h3><p>->실수로 반환</p>");
x = "10.3333 20";
document.write("<h3>x : "+x+"</h3>");
document.write("<h3>parseFloat(x) : "+parseFloat(x)+"</h3>");
x = "10.3333 aa";
document.write("<h3>x : "+x+"</h3>");
document.write("<h3>parseFloat(x) : "+parseFloat(x)+"</h3>");
x = "aa 10.3333";
document.write("<h3>x : "+x+"</h3>");
document.write("<h3>parseFloat(x) : "+parseFloat(x)+"</h3>");
x = 9.656;
document.write("<h3>x : "+x+"</h3>");
document.write("<h3>x.toFixed(0) : "+x.toFixed(0)+"</h3>");
document.write("<h3>x.toFixed(1) : "+x.toFixed(1)+"</h3>");
document.write("<h3>x.toFixed(2) : "+x.toFixed(2)+"</h3>");//미화($)에서 많이 사용됨
document.write("<h3>x.toFixed(3) : "+x.toFixed(3)+"</h3>");
document.write("<h3>x.toFixed(4) : "+x.toFixed(4)+"</h3>");
document.write("<hr/>");
document.write("<h3>Number.MAX_VALUE : "+Number.MAX_VALUE+"</h3>");
</script>
</body>
</html>
※ 출력내용
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