function IsFloatByBit (value, state, bit) {
if (state == false) {
var reg = new RegExp("^\\d+(\\.\\d{" + bit + "})*$", "ig");
return reg.test(value);
} else {
var reg = new RegExp("^[-]?\\d+(\\.\\d{" + bit + "})*$", "ig");
return reg.test(value);
}
}