Object.defineProperty(window.top.PWR_Percents,'name', { //.frames[0] get: function () { return name; }, set: function (newValue) { name = newValue; modifyStyle(); } }); function modifyStyle(){ let electricity = window.top.PWR_Percents; $(".btn").removeClass('disabledBtn remindBtn'); console.log("electricity",electricity) if(electricity <= 20){ $(".btn").addClass('disabledBtn'); } if(electricity <= 30){ $(".btn").addClass('remindBtn'); } }