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• 句法
• 描述
• 范例
• 规范
• 浏览器兼容性
• 另请参阅
• 相关话题

setMonth() method sets the month for a specified date according to the currently set year.

句法

dateObj.setMonth(monthValue[, dayValue])
					

Versions prior to JavaScript 1.3

dateObj.setMonth(monthValue)
					

参数

monthValue

A zero-based integer representing the month of the year offset from the start of the year. So, 0 represents January, 11 represents December, -1 represents December of the previous year, and 12 represents January of the following year.

dayValue

Optional. An integer from 1 to 31, representing the day of the month.

返回值

The number of milliseconds between 1 January 1970 00:00:00 UTC and the updated date.

描述

If you do not specify the dayValue parameter, the value returned from the getDate() method is used.

If a parameter you specify is outside of the expected range, setMonth() attempts to update the date information in the Date object accordingly. For example, if you use 15 for monthValue , the year will be incremented by 1, and 3 will be used for month.

The current day of month will have an impact on the behaviour of this method. Conceptually it will add the number of days given by the current day of the month to the 1st day of the new month specified as the parameter, to return the new date. For example, if the current value is 31st August 2016, calling setMonth with a value of 1 will return 2nd March 2016. This is because in 2016 February had 29 days.

范例

使用 setMonth()

var theBigDay = new Date();
theBigDay.setMonth(6);
//Watch out for end of month transitions
var endOfMonth = new Date(2016, 7, 31);
endOfMonth.setMonth(1);
console.log(endOfMonth); //Wed Mar 02 2016 00:00:00
					

规范

规范
ECMAScript (ECMA-262) The definition of 'Date.prototype.setMonth' in that specification.

浏览器兼容性

The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.

更新 GitHub 上的兼容性数据

	Desktop						Mobile						Server
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet	Node.js
setMonth	Chrome 1	Edge 12	Firefox 1	IE 3	Opera 3	Safari 1	WebView Android 1	Chrome Android 18	Firefox Android 4	Opera Android 10.1	Safari iOS 1	Samsung Internet Android 1.0	nodejs 0.1.100

图例

完整支持

完整支持

另请参阅

• Date.prototype.getMonth()
• Date.prototype.setUTCMonth()

元数据

• 最后修改： Mar 4, 2020

相关话题

1. 标准内置对象
2. Date
3. 方法
   1. Date.UTC()
   2. Date.now()
   3. Date.parse()
   4. Date.prototype.getDate()
   5. Date.prototype.getDay()
   6. Date.prototype.getFullYear()
   7. Date.prototype.getHours()
   8. Date.prototype.getMilliseconds()
   9. Date.prototype.getMinutes()
   10. Date.prototype.getMonth()
   11. Date.prototype.getSeconds()
   12. Date.prototype.getTime()
   13. Date.prototype.getTimezoneOffset()
   14. Date.prototype.getUTCDate()
   15. Date.prototype.getUTCDay()
   16. Date.prototype.getUTCFullYear()
   17. Date.prototype.getUTCHours()
   18. Date.prototype.getUTCMilliseconds()
   19. Date.prototype.getUTCMinutes()
   20. Date.prototype.getUTCMonth()
   21. Date.prototype.getUTCSeconds()
   22. Date.prototype.getYear()
   23. Date.prototype.setDate()
   24. Date.prototype.setFullYear()
   25. Date.prototype.setHours()
   26. Date.prototype.setMilliseconds()
   27. Date.prototype.setMinutes()
   28. Date.prototype.setMonth()
   29. Date.prototype.setSeconds()
   30. Date.prototype.setTime()
   31. Date.prototype.setUTCDate()
   32. Date.prototype.setUTCFullYear()
   33. Date.prototype.setUTCHours()
   34. Date.prototype.setUTCMilliseconds()
   35. Date.prototype.setUTCMinutes()
   36. Date.prototype.setUTCMonth()
   37. Date.prototype.setUTCSeconds()
   38. Date.prototype.setYear()
   39. Date.prototype.toDateString()
   40. Date.prototype.toGMTString()
   41. Date.prototype.toISOString()
   42. Date.prototype.toJSON()
   43. Date.prototype.toLocaleDateString()
   44. Date.prototype.toLocaleString()
   45. Date.prototype.toLocaleTimeString()
   46. Date.prototype.toSource()
   47. Date.prototype.toString()
   48. Date.prototype.toTimeString()
   49. Date.prototype.toUTCString()
   50. Date.prototype.valueOf()
   51. Date.prototype[@@toPrimitive]
4. 继承：
5. Function
6. 特性
   1. Function.arguments
   2. Function.caller
   3. Function.displayName
   4. Function.length
   5. Function.name
7. 方法
   1. Function.prototype.apply()
   2. Function.prototype.bind()
   3. Function.prototype.call()
   4. Function.prototype.toSource()
   5. Function.prototype.toString()
8. Object
9. 特性
   1. Object.prototype.__proto__
   2. Object.prototype.constructor
10. 方法
    1. Object.prototype.__defineGetter__()
    2. Object.prototype.__defineSetter__()
    3. Object.prototype.__lookupGetter__()
    4. Object.prototype.__lookupSetter__()
    5. Object.prototype.hasOwnProperty()
    6. Object.prototype.isPrototypeOf()
    7. Object.prototype.propertyIsEnumerable()
    8. Object.prototype.toLocaleString()
    9. Object.prototype.toSource()
    10. Object.prototype.toString()
    11. Object.prototype.valueOf()
    12. Object.setPrototypeOf()