▶ 별모양 출력 ( 층 입력 받기 ) > SCRIPT

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<script type="text/javascript">

function gugudan(a){

var num1=a;

num1 = parseInt(num1) +1;

if(isNaN(num1)){

alert("숫자만입력해~");

}else{

var pkt="";

for(i=1; i<num1; i++){

for(j=0; j<i; j++){

pkt += "*";

}

pkt += "<br>";

}

document.getElementById("dan").innerHTML = pkt;

}

}

</script>

<h2>별 문자 출력</h2>

몇층: 

<input type="text" id="gugu" size="3" value="2"> 

<input type="button" value="출력" onclick="gugudan(document.getElementById('gugu').value)">

<br><br>

<span id="dan">출력구간</span>