如果声明有宽容

Question

我有一个用于恒温器的Domoticz LUA脚本，我想在IF语句中实现容差。

目前的代码如下：

if (current < target) then
            debuglog('Heating - Turning Physical Heater On: '.. physicalheater)
 else debuglog('Heating - Turning Physical Heater OFF: '.. physicalheater)

我想要达到的目标是：

if (current < target +-2 ) then
            debuglog('Heating - Turning Physical Heater On: '.. physicalheater)
 else debuglog('Heating - Turning Physical Heater OFF: '.. physicalheater)