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JavaScript ceil() 方法


实例

将数字向上舍入为其最接近的整数:

Math.ceil(1.4)
亲自试一试 »

页面下方有更多实例。


定义和用法

ceil() 方法将数字向上舍入为最接近的整数,并返回结果。

如果传递的参数是整数,则不会舍入该值。

说明

ceil() 方法执行的是向上取整计算,它返回的是大于或等于函数参数,并且与之最接近的整数。


浏览器支持

Math.ceil() 是 ES1 特性(JavaScript 1999)。所有浏览器都完全支持它:

方法
ceil() Yes Yes Yes Yes Yes

语法

Math.ceil(x)

参数值

参数 描述
x 必需。您要舍入的数字。

技术细节

返回值: 数值,表示向上舍入时最接近的整数。
JavaScript 版本: ECMAScript 1

更多实例

实例

对不同的数字使用 ceil() 方法:

var a = Math.ceil(0.60);
var b = Math.ceil(0.40);
var c = Math.ceil(5);
var d = Math.ceil(5.1);
var e = Math.ceil(-5.1);
var f = Math.ceil(-5.9);

The result of a,b,c,d,e, and f will be:

1
1
5
6
-5
-5
亲自试一试 »

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