js style code to display date and time in a specified format_javascript skills

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The time is the current time

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The code is as follows:

//1.2013-4-9 11:21:32
//2.April 9, 2013 11:21:32
//3.April 9, 2013 11:21:32 am
//4.April 9, 2013 13:21:32 pm Seconds
/*
var thedate = new Date();
alert(thedate.getFullYear() '-' thedate.getMonth() '-' thedate.getDate() ' ' thedate.toLocaleTimeString() );
alert(thedate.toLocaleDateString() ' ' thedate.getHours() 'point' thedate.getMinutes() 'minute' thedate.getSeconds() 'second');
if (thedate.getHours() < 12) {
alert(thedate.toLocaleDateString() 'am' thedate.getHours() 'point' thedate.getMinutes() 'minute' thedate.getSeconds() 'seconds');
}
else {
alert(thedate.toLocaleDateString() 'pm' thedate.getHours() 'point' thedate.getMinutes() 'minute' thedate.getSeconds() 'second');
}
* /

<script> /// <summary> /// 格式化显示日期时间 /// /// <param name="x">待显示的日期时间，例如new Date() /// <param name="y">需要显示的格式，例如yyyy-MM-dd hh:mm:ss function date2str(x,y) { var z = {M:x.getMonth()+1,d:x.getDate(),h:x.getHours(),m:x.getMinutes(),s:x.getSeconds()}; y = y.replace(/(M+|d+|h+|m+|s+)/g,function(v) {return ((v.length>1?"0":"")+eval('z.'+v.slice(-1))).slice(-2)}); return y.replace(/(y+)/g,function(v) {return x.getFullYear().toString().slice(-v.length)}); } alert(date2str(new Date(),"yyyy-MM-dd hh:mm:ss")); alert(date2str(new Date(),"yyyy-M-d h:m:s")); </script>