Two lines of js code output the date and time in the specified format_javascript skills

//

// Formatted display date Time
//

// The date and time to be displayed, such as new Date()
// The format that needs to be displayed, such as yyyy-MM-dd hh:mm:ss
function date2str(x,y) {
var z ={y:x.getFullYear (),M:x.getMonth() 1,d:x.getDate(),h:x.getHours(),m:x.getMinutes(),s:x.getSeconds()};
return y .replace(/(y |M |d |h |m |s )/g,function(v) {return ((v.length>1?"0":"") eval('z.' v.slice (-1))).slice(-(v.length>2?v.length:2))});
}
alert(date2str(new Date(),"yy-M-d h:m :s"));
alert(date2str(new Date(),"yyyy-MM-d h:m:s"));