实现数字输入限制的JavaScript函数

        function getEvent() {
            if (document.all) return window.event; func = this.getEvent.caller; while (func != null) {
                var arg0 = func.arguments[0];
                if (arg0) { if ((arg0.constructor == Event || arg0.constructor == MouseEvent) || (typeof (arg0) == "object" && arg0.preventDefault && arg0.stopPropagation)) { return arg0; } }
                func = func.caller;
            }
            return null;
        }
        var Origanl;
        function OnlyNum(obj) {
            var keyValue = 0;
            var oEvent = getEvent();
            var CurrentDom = $(obj);
            Origanl = CurrentDom.val();
            if (document.all) {
                keyValue = oEvent.keyCode;
                if (!((keyValue >= 48 && keyValue <= 57) || (keyValue == 8) || (keyValue == 9) || (keyValue == 190) || (keyValue == 46)))
                    oEvent.returnValue = false;
            } else {
                keyValue = oEvent.charCode;
                if (!oEvent.ctrlKey) {
                    if (((keyValue > 33 && keyValue < 45) || (keyValue == 47) || (keyValue > 58 && keyValue < 126)))
                        oEvent.preventDefault();
                }
            }
        };

        function KeyUp(obj, _bFormat) {
            var _Regex = /^[-\+]?\d{0,6}(\.\d{0,3})?$/;
            var CurrentDom = $(obj);