JavaScript 格式字符串的应用

Date.prototype.ToString = function(format){
if(typeof(format) == "string"){
return FormatDateTime(this, format);
}
return FormatDateTime(this, "yyyy-MM-dd HH:mm:ss");
}
//格式化DateTime对象
function FormatDateTime(d, format){
format = FormatYear(d, format);
format = FormatMonth(d, format);
format = FormatDay(d, format);
format = FormatHour(d, format);
format = FormatMinute(d, format);
format = FormatSecond(d, format);
return format;
}
//格式化年
function FormatYear(d, format){
var fullYear = d.getFullYear(); //完整的年份
var century = Math.floor(fullYear / 100); //世纪
var year = fullYear % 100; //年代
while(format.indexOf("y") > -1){
var regex = /[y]+/;
format = format.replace(regex,function(w){
//格式字符串如果是"y"或者"yy"时，只返回年代。否则返回世纪+年代
switch(w.length){
case 0:break;
case 1:
return year;
case 2:
return year < 10 ? "0" + year : year;
default:
var yearPart = year < 10 ? "0" + year : year;
var centuryPart = "";
for(var i = 0; i < w.length - 2 - century.toString().length; i++){
centuryPart += "0";
}
centuryPart += century;
return centuryPart + yearPart;
}
});
}
return format;
}
//格式化月
function FormatMonth(d, format){
var month = d.getMonth() + 1;
while(format.indexOf("M") > -1){
var regex = /[M]+/;
format = format.replace(regex,function(w){
switch(w.length){
case 0:break;
case 1:
return month;
case 2:
return month < 10 ? "0" + month : month;
default:
switch(month){
case 1:
return "一月";
case 2:
return "二月";
case 3:
return "三月";
case 4:
return "四月";
case 5:
return "五月";
case 6:
return "六月";
case 7:
return "七月";
case 8:
return "八月";
case 9:
return "九月";
case 10:
return "十月";
case 11:
return "十一月";
case 12:
return "十二月";
}
}
});
}
return format;
}
//格式化日
function FormatDay(d, format){
while(format.indexOf("d") > -1){
var regex = /[d]+/;
format = format.replace(regex,function(w){
switch(w.length){
case 0:break;
case 1:
return d.getDate();
case 2:
return d.getDate() < 10 ? "0" + d.getDate() : d.getDate();
case 3:
switch(d.getDay()){
case 0:
return "日";
case 1:
return "一";
case 2:
return "二";
case 3:
return "三";
case 4:
return "四";
case 5:
return "五";
case 6:
return "六";
}
default:
switch(d.getDay()){
case 0:
return "星期日";
case 1:
return "星期一";
case 2:
return "星期二";
case 3:
return "星期三";
case 4:
return "星期四";
case 5:
return "星期五";
case 6:
return "星期六";
}
}
});
}
return format;
}
//格式化小时
//H：24小时制
//h：12小时制
function FormatHour(d, format){
while(format.indexOf("H") > -1){
var regex = /[H]+/;
format = format.replace(regex,function(w){
switch(w.length){
case 0:break;
case 1:
return d.getHours();
default:
return d.getHours() < 10 ? "0" + d.getHours() : d.getHours();
}
});
}
while(format.indexOf("h") > -1){
var regex = /[h]+/;
format = format.replace(regex,function(w){
switch(w.length){
case 0:break;
case 1:
return d.getHours() > 12 ? d.getHours() - 12 : d.getHours();
default:
var t = d.getHours() > 12 ? d.getHours() - 12 : d.getHours();
return t < 10 ? "0" + t : t;
}
});
}
return format;
}
//格式化分钟
function FormatMinute(d, format){
while(format.indexOf("m") > -1){
var regex = /[m]+/;
format = format.replace(regex,function(w){
switch(w.length){
case 0:break;
case 1:
return d.getMinutes();
default:
return d.getMinutes() < 10 ? "0" + d.getMinutes() : d.getMinutes();
}
});
}
return format;
}
//格式化秒
function FormatSecond(d, format){
while(format.indexOf("s") > -1){
var regex = /[s]+/;
format = format.replace(regex,function(w){
switch(w.length){
case 0:break;
case 1:
return d.getSeconds();
default:
return d.getSeconds() < 10 ? "0" + d.getSeconds() : d.getSeconds();
}
});
}
return format;
}