dev_tool_exp/GC_Example.html at master · mizo015/dev_tool_exp · GitHub

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<html>
<head>
	<style>
		.bar{
			height: 20px;
			border:1px solid #d9d9d9;
			width: 4px;
			margin: 10px;
		}
		.bar.slow{
			background: red;
		}
		.bar.fast{
			background: green;
		}
	</style>
</head>
<body>
	<button id="start" type="button">Start</button>
	<button id="reset" type="button">Reset</button><br/>

	Fast: <div class="bar fast"></div>
	Slow: <div class="bar slow"></div>

	<script type="text/javascript">
		var startBtn = document.querySelector('#start'),
			slowBar  = document.querySelector('.slow'),
			fastBar  = document.querySelector('.fast'),
			limit 	 = 1000000;

		startBtn.addEventListener('click', function(){
			slow();
			fast();
		});

		function slow(){
			var array = [];
			for (var i = 0; i < limit; i++) {
				array.push(i);
			}
			// slowBar.style.width = 1000 + 'px';
			console.log('Slow Func Done');
		}

		function fast(){
			var array = new Array(limit);
			for (var i = 0; i < limit; i++) {
				array[i] = i;
			}

			// fastBar.style.width = 1000 + 'px';
			console.log('Fast Func Done');
		}
	</script>
</body>
</html>