秒转 时间格式 JavaScript seconds to time with format hh:mm:ss

String.prototype.toHHMMSS =function(){var sec_num = parseInt(this,10);// don't forget the second parmvar hours   =Math.floor(sec_num /3600);var minutes =Math.floor((sec_num -(hours *3600))/60);var seconds = sec_num -(hours *3600)-(minutes *60);if(hours   <10){hours   ="0"+hours;}if(minutes <10){minutes ="0"+minutes;}if(seconds <10){seconds ="0"+seconds;}var time    = hours+':'+minutes+':'+seconds;return time;}