В учебнике Jquery.Продвинутое руководство по Javascript есть такой пример
(function($){
$.formatDate = function(date,pattern) {
var result = [];
while (pattern.length>0) {//You don't need to use jQuery to get the length of a string because it is a basic JavaScript string object property: somestring.length;
/*--------do not understand------------*/
$.formatDate.patternParts.lastIndex = 0;//This property returns an integer that specifies the character position immediately after the last match found by exec( ) or test( ) methods.
var matched = $.formatDate.patternParts.exec(pattern);//The exec() method tests for a match in a string. - RegExpObject.exec(string) ;eturns the matched text if it finds a match, otherwise it returns null.
alert('pattern:'+pattern);
alert('matched[0]:'+matched[0]);
if (matched) {
result.push($.formatDate.patternValue[matched[0]].call(this,date));
pattern = pattern.slice(matched[0].length);
}
else {
result.push(pattern.charAt(0));
pattern = pattern.slice(1);
}
}
return result.join('');
};
/*--------do not understand------------*/
$.formatDate.patternParts =
/^(yy(yy)?|M(M(M(M)?)?)?|d(d)?|EEE(E)?|a|H(H)?|h(h)?|m(m)?|s(s)?|S)/;
$.formatDate.monthNames = [
'January','February','March','April','May','June','July',
'August','September','October','November','December'
];
$.formatDate.dayNames = [
'Sunday','Monday','Tuesday','Wednesday','Thursday','Friday',
'Saturday'
];
$.formatDate.patternValue = {
yy: function(date) {
return $.toFixedWidth(date.getFullYear(),2);
},
yyyy: function(date) {
return date.getFullYear().toString();
},
MMMM: function(date) {
return $.formatDate.monthNames[date.getMonth()];
},
MMM: function(date) {
return $.formatDate.monthNames[date.getMonth()].substr(0,3);
},
MM: function(date) {
return $.toFixedWidth(date.getMonth()+1,2);
},
M: function(date) {
return date.getMonth()+1;
},
dd: function(date) {
return $.toFixedWidth(date.getDate(),2);
},
d: function(date) {
return date.getDate();
},
EEEE: function(date) {
return $.formatDate.dayNames[date.getDay()];
},
EEE: function(date) {
return $.formatDate.dayNames[date.getDay()].substr(0,3);
},
HH: function(date) {
return $.toFixedWidth(date.getHours(),2);
},
H: function(date) {
return date.getHours();
},
hh: function(date) {
var hours = date.getHours();
return $.toFixedWidth(hours>12 ? hours - 12 : hours,2);
},
h: function(date) {
return date.getHours()%12;
},
mm: function(date) {
return $.toFixedWidth(date.getMinutes(),2);
},
m: function(date) {
return date.getMinutes();
},
ss: function(date) {
return $.toFixedWidth(date.getSeconds(),2);
},
s: function(date) {
return date.getSeconds();
},
S: function(date) {
return $.toFixedWidth(date.getMilliseconds(),3);
},
a: function(date) {
return date.getHours() < 12 ? 'AM' : 'PM';
}
};
$.toFixedWidth = function(value,length,fill) {
var result = (value || '').toString();
fill = fill || '0';
var padding = length - result.length;
if (padding < 0) {
result = result.substr(-padding);
}
else {
for (var n = 0; n < padding; n++) result = fill + result;
}
return result;
};
})(jQuery);
<!DOCTYPE html>
<html>
<head>
<title>$.dateFormat() test</title>
<link rel="stylesheet" type="text/css" href="../styles/core.css">
<script type="text/javascript" src="../scripts/jquery-1.4.js"></script>
<script type="text/javascript" src="jquery.jqia.formatDate.js"></script>
<script type="text/javascript">
var testPatterns = [
'yyyy','yy','MMMM','MMM','MM','M','dd','d','EEEE','EEE','a',
'HH','H','hh','h','mm','m','ss','s','S',
'EEEE MMMM, d yyyy hh:mm:ss.S a',
'M/d/yy HH:mm'
];
</script>
</head>
<body>
<div>
<script>
var now = new Date();
document.write('<div>Test date: '+now+'</div>');
$.each(testPatterns,function(){
document.write('<div>'+this+'='+$.formatDate(now,this)+'</div>');
});
</script>
</div>
</body>
</html>
Можете, пожалуйста, кто знает, как это работает, прокомментировать код внутри комментариев /*--------do not understand------------*/ )) Почему переменная matched превращается из строки в массив и когда я оставляю в вызове функции в HTML только последние два вида форматирования, функция перестает работать. И что это за регулярное выражение
