input js 只能输入两位小数

onkeyup="value = (value || '').replace(/[^\d\.]/, '').replace(/^0{1,}(\d+)/, '$1').replace(/^\.{1,}(\d*)/, '$1') .replace(/^(\d+)\.+(\d*)$/, '$1.$2').replace(/^(\d+)\.(\d\d).*$/,'$1.$2')