export function guid ( ) { function s4 ( ) { return Math . floor ( ( 1 + Math . random ( ) ) * 0x10000 ) . toString ( 16 ) . substring ( 1 ) ; } return s4 ( ) + s4 ( ) + '-' + s4 ( ) + '-' + s4 ( ) + '-' + s4 ( ) + '-' + s4 ( ) + s4 ( ) + s4 ( ) ; } export function getTimeString ( ) { let now = new Date ( ) ; return `${ now . getFullYear ( ) }-${ now . getMonth ( ) + 1 }-${ now . getDate ( ) } ${ now . getHours ( ) }:${ now . getMinutes ( ) }:${ now . getSeconds ( ) }` ; }