Question

如何在jQuery中获取上个月的名称？它不适用于 december 月。

var now = new Date();
var currentYear = (new Date).getFullYear();
var currentMonth = GetMonthName((new Date).getMonth());
var lastMonth = GetMonthName((now.getMonth() - 1));

function GetMonthName(monthNumber) {
    var months = ['January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December'];
    return months[monthNumber];
}

我在代码中尝试了一些不同的东西，但没有运气。

Answer 1

另一种方法：

function GetMonthName(monthNumber) {
  var months = ['December', 'January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December'];
  return months[++monthNumber];
}

console.log(GetMonthName(-1));
console.log(GetMonthName(0));
console.log(GetMonthName(11));

或更简单：

function GetMonthName(monthNumber) {
  var months = ['January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December'];
  return months[monthNumber] || 'December';
}

console.log(GetMonthName(-1));
console.log(GetMonthName(0));
console.log(GetMonthName(11));

或使用数组的slice方法：

function GetMonthName(monthNumber) {
  var months = ['January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December'];
  return months.slice(monthNumber)[0];
}

console.log(GetMonthName(-1));
console.log(GetMonthName(0));
console.log(GetMonthName(11));

Answer 2

对于任何前一个月，这应该有效：

function GetMonthName(monthNumber) {
  monthNumber = monthNumber < 0 ? 11 : monthNumber;
  var months = ['January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December'];
  return months[monthNumber];
}

Answer 3

您可以尝试使用上个月：jsfiddle.net/bharatsing/jc3gpwfn/

var now = new Date();
var currentYear = (new Date).getFullYear();
var currentMonth = GetMonthName((new Date).getMonth());

var newdate=new Date(now.setMonth(now.getMonth() - 1));
var lastMonth = GetMonthName((newdate.getMonth()));
alert(lastMonth);
function GetMonthName(monthNumber) {
    var months = ['January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December'];
    return months[monthNumber];
}

Answer 4

var lastMonth = GetMonthName((now.getMonth() - 1));
if(lastMonth < 0) lastMonth = 11;

如何获得上个月（DECEMBER）的名字 - JQUERY

4 个答案: