Date.prototype.getMonth()

¥Syntax

getMonth()

¥Parameters

没有任何。

¥None.

¥Return value

0 到 11 之间的整数，表示给定日期根据当地时间的月份：0 代表一月，1 代表二月，依此类推。如果日期是 invalid，则返回 NaN。

¥An integer, between 0 and 11, representing the month for the given date according to local time: 0 for January, 1 for February, and so on. Returns NaN if the date is invalid.

¥Description

getMonth() 的返回值是从零开始的，这对于索引月份数组很有用，例如：

¥The return value of getMonth() is zero-based, which is useful for indexing into arrays of months, for example:

const valentines = new Date("1995-02-14");
const month = valentines.getMonth();
const monthNames = ["January", "February", "March" /* , … */];

console.log(monthNames[month]); // "February"

但是，出于国际化的目的，你应该更喜欢使用 Intl.DateTimeFormat 和 options 参数。

¥However, for the purpose of internationalization, you should prefer using Intl.DateTimeFormat with the options parameter instead.

const options = { month: "long" };
console.log(new Intl.DateTimeFormat("en-US", options).format(valentines));
// "February"
console.log(new Intl.DateTimeFormat("de-DE", options).format(valentines));
// "Februar"

¥Examples

¥Using getMonth()

基于 Date 对象 xmas95 的值，month 变量具有值 11。

¥The month variable has value 11, based on the value of the Date object xmas95.

const xmas95 = new Date("1995-12-25T23:15:30");
const month = xmas95.getMonth();

console.log(month); // 11

¥See also

• Date.prototype.getUTCMonth()
• Date.prototype.setMonth()