Edit in JSFiddle

var btn = document.getElementById("btn");
var result = document.getElementById("result");
btn.onclick = function(){
	function isOdd(num) {
    return num % 2 == 1;
    }
    function isEven(num) {
        return num % 2 == 0;
    }
    function isSane(num) {
        return isEven(num) || isOdd(num);
    }
    var values = [7, 4, '13', -9, Infinity];
    result.innerHTML = values.map(isSane);
}

<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;
}