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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

Math.max() function returns the largest of the zero or more numbers given as input parameters.

The source for this interactive example is stored in a GitHub repository. If you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.

句法

Math.max([value1[, value2[, ...]]])
					

参数

value1, value2, ...

Numbers.

返回值

The largest of the given numbers. If at least one of the arguments cannot be converted to a number, NaN 被返回。

描述

因为 Math is not a constructor, max() is a static method of Math (You always use it as Math.max() , rather than as a method of an instanced Math 对象)。

- Infinity is the initial comparant because almost every other value is bigger, that's why when no arguments are given, - Infinity 被返回。

If at least one of arguments cannot be converted to a number, the result is NaN .

范例

使用 Math.max()

Math.max(10, 20);   //  20
Math.max(-10, -20); // -10
Math.max(-10, 20);  //  20
					

Getting the maximum element of an array

Array.reduce() can be used to find the maximum element in a numeric array, by comparing each value:

var arr = [1,2,3];
var max = arr.reduce(function(a, b) {
    return Math.max(a, b);
});
					

The following function uses Function.prototype.apply() to get the maximum of an array. getMaxOfArray([1, 2, 3]) 相当于 Math.max(1, 2, 3) , but you can use getMaxOfArray() on programmatically constructed arrays. This should only be used for arrays with relatively few elements.

function getMaxOfArray(numArray) {
  return Math.max.apply(null, numArray);
}
					

The new spread operator is a shorter way of writing the apply solution to get the maximum of an array:

var arr = [1, 2, 3];
var max = Math.max(...arr);
					

However, both spread ( ... ) and apply will either fail or return the wrong result if the array has too many elements, because they try to pass the array elements as function parameters. See 使用 apply and built-in functions for more details. The reduce solution does not have this problem.

规范

规范
ECMAScript (ECMA-262) The definition of 'Math.max' 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
max	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

• Math.min()

元数据

• 最后修改： Apr 27, 2020

相关话题

1. 标准内置对象
2. Math
3. 特性
   1. Math.E
   2. Math.LN10
   3. Math.LN2
   4. Math.LOG10E
   5. Math.LOG2E
   6. Math.PI
   7. Math.SQRT1_2
   8. Math.SQRT2
4. 方法
   1. Math.abs()
   2. Math.acos()
   3. Math.acosh()
   4. Math.asin()
   5. Math.asinh()
   6. Math.atan()
   7. Math.atan2()
   8. Math.atanh()
   9. Math.cbrt()
   10. Math.ceil()
   11. Math.clz32()
   12. Math.cos()
   13. Math.cosh()
   14. Math.exp()
   15. Math.expm1()
   16. Math.floor()
   17. Math.fround()
   18. Math.hypot()
   19. Math.imul()
   20. Math.log()
   21. Math.log10()
   22. Math.log1p()
   23. Math.log2()
   24. Math.max()
   25. Math.min()
   26. Math.pow()
   27. Math.random()
   28. Math.round()
   29. Math.sign()
   30. Math.sin()
   31. Math.sinh()
   32. Math.sqrt()
   33. Math.tan()
   34. Math.tanh()
   35. Math.trunc()
5. 继承：
6. Object
7. 特性
   1. Object.prototype.__proto__
   2. Object.prototype.constructor
8. 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()