JavaScript - control

• if문

	let va = prompt('숫자를 입력하세요');
	let res = null;
	if(va%2 ==1){
		res = '홀수';
	}else {
		res = '짝수';
	}
	console.log(va + ' ' + res);

• switch문

	let no = prompt('숫자 입력(1 ~ 3)');
	let word = null;
	switch(no){
		case "1":
			word = 'one'; break;
		case "2":
			word = 'two'; break;
		case "3":
			word = 'three';	break;
		default:
			word = '?,?';
	}
	console.log(no + ' - ' + word);

• for문

		let all = '<table>';
		for(let r =2; r <=9; r ++){
			all +='<tr>';
			for( let d=1; d<=9; d++){
				all +='<td>' + r + ' X ' + d + ' = '+ (r*d) + '</td>';
			}
			all +='</tr>';
		}
		all += '</table>';
		document.write(all);

** 테이블을 사용해서 줄바꿈을 tr로 해줌

• while문

	<script type="text/javascript">
		let data =1;
		while(data<=10){
			document.write('data : ' + data + '<br/>');
			++data;
		}
		document.write('<br/>');
		
		let value = 5;
		let sum =0;
		do {
			sum += value;
			value +=5;
			document.write('value : ' + value + '- sum : ' + sum + '<br/>');
		} while(sum<=100);
		document.write('<strong>sum : '+ sum + '</strong>');
	</script>