javascript - how to round to nearest integer [dupl

问题:

This question already has answers here:

Closed 8 years ago.

Possible Duplicate:
How can I round of to whole numbers in JavaScript?

In javascript is there a function which allows me to round to the nearest integer? Either up or down.

So:

2.1 = 2
2.9 = 3
4.5 = 5
1.1 = 1

回答1:

Use Math.round(number):

var i = Math.round(2.1);

回答2:

Math.round(x) and Math.floor(x)

both documented here

回答3:

use Math.round()

EDIT:

Mine was wrong the one above me is correct