千分位表示の変換

        <input type="text" />
        <button>click</button>
        <p class="cont"></p>

<script> $("button").click(function () { number = $("input").val().toString(); if (/^-?\d+\.?\d+$/.test(number)) { while (/\d{4}/.test(number)) { number = number.replace(/(\d+)(\d{3})/, '$1,$2'); } $("p").text(number); } });