Formatting time code sharing in js

In js, it is often required to format the output format of time, such as 2017-01-01 10:10. The more troublesome ones are month, day, hour, and minute. Their format generally requires two digits. If it is less than 10, you need to add 0 in front. Of course, this is not a problem and can be done through judgment, such as day = day>10?day:("0"+day); But this I write too much code and always want to write some innovative code.

var format= function(obj){

　　　　 return (obj/100).toFixed(2).split('.').pop();

　　　}

var time= new Date();

timeStr= time.getFullYear()+"-"+format(time.getMonths())+"-"+format(time.getDate ())+" "+ format(time.getHours())+":"format(time.getMinutes());

Although the code has not been reduced much, it is tidier. In my opinion

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