Edit in JSFiddle

var btn = document.getElementById("btn");
var result = document.getElementById("result");
btn.onclick = function(){
	var two   = 0.2
    var one   = 0.1
    var eight = 0.8
    var six   = 0.6
    result.innerHTML = [two - one == one, eight - six == two];
}

<p>点击查看结果：</p>
<button id="btn">查看结果</button>
<p>结果：</p>
<div id="result"></div>

p {
    font-size: 14px;
    height 24px;
    line-height: 24px;
}