magnet88jp/check_exist.html

## check_exist.html
<html>
<head>
</head>
<body>
<h1>test</h1>

<script>
var aaa = '';
var bbb = '0';
var ccc = '1';
var ddd;
var eee = null;
var fff = ' ';
var ggg = 0;
var hhh = 1;

var test = !!(aaa) ? aaa : 'ng';
console.log('aaa='+ test);
test = !!(bbb) ? bbb : 'ng';
console.log('bbb='+ test);
test = !!(ccc) ? ccc : 'ng';
console.log('ccc='+ test);
test = !!(ddd) ? ddd : 'ng';
//test = (ddd != null && ddd.length > 0) ? ddd : 'ng';
console.log('ddd='+ test);
test = !!(eee) ? eee : 'ng';
console.log('eee='+ test);
test = !!(fff) ? fff : 'ng';
console.log('fff='+ test);
//test = !!(ggg) ? ggg : 'ng';
test = (ggg != null && ggg.length > 0) ? ddd : 'ng';
console.log('ggg='+ test);
test = !!(hhh) ? hhh : 'ng';
console.log('hhh='+ test);
</script>
</body>
</html>
	<html>
	<head>
	</head>
	<body>
	<h1>test</h1>

	<script>
	var aaa = '';
	var bbb = '0';
	var ccc = '1';
	var ddd;
	var eee = null;
	var fff = ' ';
	var ggg = 0;
	var hhh = 1;

	var test = !!(aaa) ? aaa : 'ng';
	console.log('aaa='+ test);
	test = !!(bbb) ? bbb : 'ng';
	console.log('bbb='+ test);
	test = !!(ccc) ? ccc : 'ng';
	console.log('ccc='+ test);
	test = !!(ddd) ? ddd : 'ng';
	//test = (ddd != null && ddd.length > 0) ? ddd : 'ng';
	console.log('ddd='+ test);
	test = !!(eee) ? eee : 'ng';
	console.log('eee='+ test);
	test = !!(fff) ? fff : 'ng';
	console.log('fff='+ test);
	//test = !!(ggg) ? ggg : 'ng';
	test = (ggg != null && ggg.length > 0) ? ddd : 'ng';
	console.log('ggg='+ test);
	test = !!(hhh) ? hhh : 'ng';
	console.log('hhh='+ test);
	</script>
	</body>
	</html>