Js_Date格式化函数

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Date.prototype.format = function(mask) {

var d = this;

var zeroize = function (value, length) {

if (!length) length = 2;

value = String(value);

for (var i = 0, zeros = ''; i < (length - value.length); i++) {

zeros += '0';

}

return zeros + value;

};

return mask.replace(/"[^"]*"|'[^']*'|/b(?:d{1,4}|m{1,4}|yy(?:yy)?|([hHMstT])/1?|[lLZ])/b/g, function($0) {

switch($0) {

case 'd': return d.getDate();

case 'dd': return zeroize(d.getDate());

case 'ddd': return ['Sun','Mon','Tue','Wed','Thr','Fri','Sat'][d.getDay()];

case 'dddd': return ['Sunday','Monday','Tuesday','Wednesday','Thursday','Friday','Saturday'][d.getDay()];

case 'M': return d.getMonth() + 1;

case 'MM': return zeroize(d.getMonth() + 1);

case 'MMM': return ['Jan','Feb','Mar','Apr','May','Jun','Jul','Aug','Sep','Oct','Nov','Dec'][d.getMonth()];

case 'MMMM': return ['January','February','March','April','May','June','July','August','September','October','November','December'][d.getMonth()];

case 'yy': return String(d.getFullYear()).substr(2);

case 'yyyy': return d.getFullYear();

case 'h': return d.getHours() % 12 || 12;

case 'hh': return zeroize(d.getHours() % 12 || 12);

case 'H': return d.getHours();

case 'HH': return zeroize(d.getHours());

case 'm': return d.getMinutes();

case 'mm': return zeroize(d.getMinutes());

case 's': return d.getSeconds();

case 'ss': return zeroize(d.getSeconds());

case 'l': return zeroize(d.getMilliseconds(), 3);

case 'L': var m = d.getMilliseconds();

if (m > 99) m = Math.round(m / 10);

return zeroize(m);

case 'tt': return d.getHours() < 12 ? 'am' : 'pm';

case 'TT': return d.getHours() < 12 ? 'AM' : 'PM';

case 'Z': return d.toUTCString().match(/[A-Z]+$/);

// Return quoted strings with the surrounding quotes removed

default: return $0.substr(1, $0.length - 2);

}

});

};

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