Question

我在今年年中的工作正常，但现在我们已经过了新的一年，我的代码断了。我需要获得前6个月的月份名称和年份。

我修改过的代码：

var monthNames = ["January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"];

var today = new Date();
var year = today.getFullYear();
var month = today.getMonth();

var i = 0;
do {
    $("#pickWinners_month").append($("<option />").val((month > 8 ? "" : "0") + month + "/01/" + year).html(monthNames[month - 1] + " " + year));
    if (month == 0) {
        month = 11;
        year--;
    } else {
        month--;
    }

    i++;
} while (i < 6);

有人能帮我一把吗？

Answer 1

你可以做这样的事情

var monthNames = ["January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"];

var today = new Date();
var d;
var month;

for(var i = 6; i > 0; i -= 1) {
  d = new Date(today.getFullYear(), today.getMonth() - i, 1);
  month = monthNames[d.getMonth()];
  console.log(month);
}

Run code

Answer 2

我将在@zynetro提供的答案上进一步扩展以包括年份。

var monthNames = ["January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"];

var today = new Date();
var d;
var month;
var year;

for(var i = 6; i > 0; i -= 1) {
  d = new Date(today.getFullYear(), today.getMonth() - i, 1);
  month = monthNames[d.getMonth()];
  year = d.getFullYear();
  console.log(month);
  console.log(year);
}

以下是fiddle。

Answer 3

 var monthNames = ["January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"];

var today = new Date();
var year = today.getFullYear();
var month = today.getMonth();
var i = 0;

do {

    if (month < 0) {
        month = 11;
        year--;
    }

    $("#pickWinners_month").append($("<option />").val((month > 9 ? "" : "0") + month + "/01/" + year).html(monthNames[month] + " " + year));

    month--;
    i++;
} while (i < 6);

这是一个有效的Sample

Answer 4

正如zaynetro所说，你有错误的月份指数：

即monthNames [月]
月== 0
month = 11

以下是完整代码：

var monthNames = ["January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"];

var today = new Date();
var year = today.getFullYear();
var month = today.getMonth();

var i = 0;
do {
    $("#pickWinners_month").append($("<option />").val((month > 9 ? "" : "0") + month + "/01/" + year).html(monthNames[month] + " " + year));
    if (month == 0) {
        month = 11;
        year--;
    } else {
        month--;
    }

    i++;
} while (i < 6);

Answer 5

您可以这样做：

$date ='2015-01-01'
for (int i=0;i<6; i++){
    $datemonthBefore = date('Y-m-d',strtotime('-i months', strtotime($date)));
    var month = datemonthBefore.getMonth();
}

Answer 6

看起来我明白了。从今天起减去一个月的日期，然后将其用作新的开始日期。

var monthNames = ["January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"];

var lastMonth = new Date();
lastMonth.setMonth(lastMonth.getMonth() - 1);
var year = lastMonth.getFullYear();
var month = lastMonth.getMonth();

var i = 0;
do {
    $("#pickWinners_month").append($("<option />").val((month > 9 ? "" : "0") + month + "/01/" + year).html(monthNames[month] + " " + year));
    if (month == 0) {
        month = 11;
        year--;
    } else {
        month--;
    }

    i++;
} while (i < 6);

Answer 7

const today = new Date();
let lastSixMonths = []

for (var i = 6; i > 0; i -= 1) {
    const date = new Date(today.getFullYear(), today.getMonth() - i, 1);
    lastSixMonths.push(moment(date).format("MMMM YYYY"))
}

return lastSixMonths.reverse() // Result

列出过去6个月的月份名称和年份

7 个答案: