Setinterval() Not Working On Firefox

Hi i'm quite new to java script and for some reason setInterval does not seem to work when i run this code on firefox. Ive tried running it on Microsoft edge but it still does not

Solution 1:

document.write( is 1990's code - don't use it at all ... also setInterval("printTime()", 1000) in code less than 30 years old is written setInterval(printTime, 1000)

functionprintTime(){
        var now = newDate();
        var hours = now.getHours();
        var mins = now.getMinutes();
        var seconds = now.getSeconds();
        document.body.innerHTML += (hours+":"+mins+":"+seconds+"<br \>");
    }

    setInterval(printTime, 1000);//in ms

The reason document.write fails is documented here

Note: as document.write writes to the document stream, calling document.write on a closed (loaded) document automatically calls document.open, which will clear the document.