Javascript 扩展Date对象，实现字符串与Date按指定格式字符串互转
Date.format = function(d, mask){ 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); } });};Date.prototype.format = function(mask) { return Date.format(this, mask);};Date.parseFormat = function(str, format){ var pattern = format.replace(/(yyyy)/g, "([0-9]{4})") .replace(/(yy)|(MM)|(dd)|(hh)|(mm)|(ss)/g, "([0-9]{2})") .replace(/[Mdhms]/g, "([0-9]{1,2})"); var getIndex = function(expr1, expr2) { var index = format.indexOf(expr1); if (index == -1) index = format.indexOf(expr2); return index; } var returnDate; if (new RegExp(pattern).test(str)) { var yPos = getIndex("yyyy", "yy"); var mPos = getIndex("MM", "M"); var dPos = getIndex("dd", "d"); var hPos = getIndex("hh", "h"); var miPos = getIndex("mm", "m"); var sPos = getIndex("ss", "s"); var data = {y: 0,m: 0,d: 0,h: 0,mi: 0,s: 0}; var pos = [yPos + ",y", mPos + ",m", dPos + ",d", hPos + ",h", miPos + ",mi", sPos + ",s"].sort(function(a, b) { a = parseInt(a.split(',')[0]); b = parseInt(b.split(',')[0]); return a > b; }); var tmpIndex = 0; var newPos = []; for (var i = 0, l = pos.length; i < l; i++) { if (parseInt(pos[i].split(',')[0]) != -1) { newPos[tmpIndex] = pos[i]; tmpIndex++; } } var m = str.match(pattern); for (var i = 1, l = m.length; i < l; i++) { if (i == 0) break; var flag = newPos[i - 1].split(',')[1]; data[flag] = m[i]; }; data.y = data.y || today.getFullYear(); data.d = data.d || today.getDate(); if (data.y.toString().length == 2) data.y = parseInt('20' + data.y); data.m -= 1; returnDate = new Date(data.y, data.m, data.d, data.h, data.mi, data.s); } return returnDate;};var time1 = new Date("2012/01/01 00:00:00 UTC+800");var str1 = time1.format("yyyy年MM月dd日 H时mm分ss秒 TT")console.log("Date["+time1+"]");console.log("格式化结果为：" + str1);var str2 = "2012年1月23日";var time2 = Date.parseFormat(str2, "yyyy年M月dd日");console.log("时间字符串："+str2);console.log("格式化结果: Date["+time2+"]");TAG:
