前端js、jQuery实现日期格式化、字符串格式化

function StringFormat() {
if (arguments.length == 0)
return null;
var str = arguments[0];
for (var i = 1; i < arguments.length; i++) {
var re = new RegExp('\\{' + (i - 1) + '\\}', 'gm');
str = str.replace(re, arguments[i]);
}
return str;
}

function Format(now,mask)
{
var d = now;
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);
}
});
};