JavaScript通过Date-Mask将日期转换成字符串的方法
本文实例讲述了JavaScript通过Date-Mask将日期转换成字符串的方法。分享给大家供大家参考。具体实现方法如下：
varMonthNames=["January","February","March","April","May","June","July","August","September","October","November","December"];
varDayNames=["Sunday","Monday","Tueday","Wednesday","Thursday",
"Friday","Saturday"];
varShortMths=["Jan","Feb","Mar","Apr","May","Jun","Jul","Aug",
"Sep","Oct","Nov","Dec"];
varShortDays=["Sun","Mon","Tue","Wed","Thu","Fri","Sat"];
varStringToDate=function(sDate,sFormat,cutOff){
//Input:adatevalueasastring,it'sformatasastringe.g.'dd-mmm-yy'
//Optional:acutoff(integer)for2digityears.
//Ifno'd'appearsintheformatstringthenthe1stofthemonthisassumed.
//Iftheyearis20andthecut-offis30thenthevaluewillbeconverted
//to2020;iftheyearis40thenthiswillbeconvertedto1940.
//Ifnocut-offissuppliedthen'20'willbepre-pendedtotheyear(YY).
//Output:astringintheformat'YYYY/MM/DD'or''
//Willnotattempttoconvertcertaincombinationse.g.DMM,MDD,DDM,YYYYD.
varsParsed,fndSingle;
//sParsedwillbeconstructedintheformat'YYYY/MM/DD'
sDate=sDate.toString().toUpperCase();
sFormat=sFormat.toUpperCase();
if(sFormat.search(/MMMM|MMM/)+1){//replaceMar/Marchwith03,etc.
sDate=sDate.replace(newRegExp('('+ShortMths.join('|')+')[A-Z]*','gi'),
function(m){
vari=ShortMths.indexOf(m.charAt(0).toUpperCase()+
m.substr(1,2).toLowerCase())+1;
return((i<10)?"0"+i:""+i).toString();
});
sFormat=sFormat.replace(/MMMM|MMM/g,'MM');
}
if(sFormat.search(/DDDD|DDD/)+1){//replaceTue/Tuesday,etc.with''
sDate=sDate.replace(newRegExp('('+ShortDays.join('|')+')[A-Z]*','gi'),'');
sFormat=sFormat.replace(/DDDD|DDD/g,'');
}
sDate=sDate.replace(/(^|\D)(\d)(?=\D|$)/g,function($0,$1,$2){
//singledigits2with02
return$1+'0'+$2;
});
sFormat=sFormat.replace(/(^|[^DMY])(D|M)(?=[^DMY]|$)/g,function($0,$1,$2){
return$1+$2+$2;//replaceDorMwithDDandMM
});
//aretherestillsingleDsorMs?
fndSingle=sFormat.search(/(^|[^D])D([^D]|$)|(^|[^M])M([^M]|$)/)+1;
//donotattempttoparse,forexample,'DMM'
if(fndSingle)return'';
sFormat=sFormat.replace(/(^|[^Y])(YY)(?=[^Y]|$)/g,function($0,$1,$2,index){
vartempDate=sDate.substr(0,index+1);
tempDate+=(cutOff)?((parseInt(sDate.substr(index+1,2),10)>cutOff)?'19':'20'):'20';
tempDate+=sDate.substr(index+1);
sDate=tempDate;
return$1+$2+$2;
});
sParsed=('YYYY/MM/DD').replace(/YYYY|MM|DD/g,function(m){
return(sFormat.indexOf(m)+1)?
sDate.substr(sFormat.indexOf(m),m.length):'';
});
if(sParsed.charAt(0)=='/'){
//ifnoyearspecified,assumethecurrentyear
sParsed=(newDate().getFullYear())+sParsed;
}
if(sParsed.charAt(sParsed.length-1)=='/'){
//ifnodate,assumethe1stofthemonth
sParsed+='01';
}
//shouldendupwith10characters..
return(sParsed.length==10)?sParsed:'';
};
希望本文所述对大家的javascript程序设计有所帮助。