jQuery 日期格式 [今天/明天/昨天/月-日] - 无法让它工作

Question

我试图实现的是，当我在这个函数中输入日期时，它应该给我这个：

如果日期为：

今天 - 输出为Today
明天 - 输出为Tomorrow
昨天 - 输出为Yesterday

否则 - 输出为"月-日"格式

但我无法让这个工作。有什么帮助吗？JsFiddle 在这里。

//My Date variable
var mydate = "22-Nov-2012"
alert(MDFormat(mydate));
/*
If the date is:
Today - show as "Today";
Tomorrow - show as "Tomorrow"
Yesterday - show as "Yesterday"
Else - show in "Month - Day format"
*/
function MDFormat(MMDD) {
MMDD= new Date(MMDD);
var months = ["Jan", "Feb", "Mar", "Apr", "May", "June", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"];
var day = MMDD.getDate();
var month = months[MMDD.getMonth()];
var currentDay = new Date().getDay();
var today;
if (currentDay == MMDD.getDay()) {
today = MMDD.getDay();
} 
var tmr = currentDay + 1; 
var yest = currentDay - 1; 
var strDate;
switch (MMDD) {
case today:
strDate = "Today";
break;
case tmr:
strDate = "Tomorrow";
break;
case yest:
strDate = "Yesterday";
break;
default:
strDate = month + "-" + day;
break;
}
return strDate;
}​

注意：我更喜欢无插件的方式。

Answer 1

getDate仅适用于有效的预定义日期格式。您使用的格式不是有效的预定义格式。如果您尝试此操作：

var mydate = "Nov 22, 2012";
alert(MDFormat(mydate));

它有效。

还冒昧地修复了您的逻辑的一些问题：

//My Date variable
var mydate = "Nov 22, 2012"
alert(MDFormat(mydate));

/*
If the date is:
Today - show as "Today";
Tomorrow - show as "Tomorrow"
Yesterday - show as "Yesterday"
Else - show in "Month - Day format"
*/
function MDFormat(MMDD) {
MMDD = new Date(MMDD);
var months = ["Jan", "Feb", "Mar", "Apr", "May", "June", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"];
var strDate = "";
var today = new Date();
today.setHours(0, 0, 0, 0);
var yesterday = new Date();
yesterday.setHours(0, 0, 0, 0);
yesterday.setDate(yesterday.getDate() - 1);
var tomorrow = new Date();
tomorrow.setHours(0, 0, 0, 0);
tomorrow.setDate(tomorrow.getDate() + 1);
console.log(MMDD.getTime(),today.getTime(),MMDD.getTime()==today.getTime());
if (today.getTime() == MMDD.getTime()) {
strDate = "Today";
} else if (yesterday.getTime() == MMDD.getTime()) {
strDate = "Yesterday";
} else if (tomorrow.getTime() == MMDD.getTime()) {
strDate = "Tomorrow";
} else {
strDate = months[MMDD.getMonth()] + "-" + MMDD.getDate();
}
return strDate;
}

演示：http://jsfiddle.net/xqnc8/4/

Answer 2

尝试使用 Datejs 插件 - 它很容易使用。 http://jsbin.com/otasiz/1/edit，我为你连接了一个可能的解决方案。另见下文：

var downTheRoad = "11/30/2012";
var yesterday = "11/20/2012";
var tomorrow = "11/22/2012";
var today = "11/21/2012";
test(downTheRoad);
test(yesterday);
test(tomorrow);
test(today);
function test(dateStr) {
var date = Date.parse(dateStr);
var today = Date.parse("today");
var todayStr = today.toString("MM/dd/yyyy");
var tomorrow = Date.parse("tomorrow");
var tomorrowStr = tomorrow.toString("MM/dd/yyyy");
var yesterday = Date.parse("yesterday");
var yesterdayStr = yesterday.toString("MM/dd/yyyy");
if (dateStr === todayStr) {
alert(dateStr + " as today");
} else if (dateStr === tomorrowStr) {
alert(dateStr + " as tomorrow");
} else if (dateStr === yesterdayStr) {
alert(dateStr + " as yesterday");
}
else {
alert(dateStr + " as " + Date.parse(dateStr).toString("MMM-dd"));
}
}