控制input框的内容输入为数字

    <script>
        function toNum(v) {
            return v.replace(/[^\d.]/g, '').replace(/^\./g, "").replace(/\.{2,}/g, ".").replace(".", "$#$").replace(/\./g, "").replace("$#$", ".");
        }
        $("[name=Amount],[name=Discount]").keyup(function () {
            $(this).val(toNum($(this).val()));
        });
        $("[name=Amount],[name=Discount]").blur(function () {
            $(this).val(toNum($(this).val()) - 0);
        });
    </script>

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只允许输入数字

验证数字的正则

[+-]?\d+(.\d+)? 数字的正则