[javascript] ++ 연산자

HTML

<p>index++</p>
<div id="result1"></div>

<p>--index</p>
<div id="result2"></div>

js

var index1 = 0;
var index2 = 0;
var result1 = 0;
var result2 = 0;

for(var loop_index = 0;loop_index < 100;loop_index++)
{
	result1 = index1++;
	document.getElementById('result1').innerHTML = "loop_index : " + loop_index.toString() + " | index : " +(result1).toString();
}

for(var loop_index = 0;loop_index < 100;loop_index++)
{
	result2 = ++index2;
	document.getElementById('result2').innerHTML = "loop_index : " + loop_index.toString() + " | index : " +(result2).toString();
}

demo link : https://jsfiddle.net/yagdmirage/e1gkz7hc/