js small and medium to take integers up down to take integers rounding to take integers to achieve of must see article

js small and medium to take integer up, down to take integer, 4 rounding 5 integer into the realization.

1. ceil () up-------ceil English means: ceiling-------------------------------------------------

2. floor () Down-------ceil English means: Ground-----is under

3. round () 4 round 5 in------ceil English means: about------is near

Look directly at the following example, and the result 1 is clear. Below the code is the corresponding print result.

Math.floor(3/4)
0
Math.floor(1/4)
0
Math.ceil(1/4)
1
Math.ceil(3/4)
1
Math.round(3/4)
1
Math.round(1/4)
0