gistfile1.txt

-1.6 'toFixed' '-2' 'ceil' -1 'floor' -2 'round' -2
-1.5 'toFixed' '-2' 'ceil' -1 'floor' -2 'round' -1
-1.4 'toFixed' '-1' 'ceil' -1 'floor' -2 'round' -1
-1 'toFixed' '-1' 'ceil' -1 'floor' -1 'round' -1
-0.5 'toFixed' '-1' 'ceil' -0 'floor' -1 'round' -0
-0.4 'toFixed' '-0' 'ceil' -0 'floor' -1 'round' -0
0 'toFixed' '0' 'ceil' 0 'floor' 0 'round' 0
0.4 'toFixed' '0' 'ceil' 1 'floor' 0 'round' 0
0.5 'toFixed' '1' 'ceil' 1 'floor' 0 'round' 1
1 'toFixed' '1' 'ceil' 1 'floor' 1 'round' 1
1.4 'toFixed' '1' 'ceil' 2 'floor' 1 'round' 1
1.5 'toFixed' '2' 'ceil' 2 'floor' 1 'round' 2
1.6 'toFixed' '2' 'ceil' 2 'floor' 1 'round' 2

hoge.js

var numbers = [
	-1.6,
	-1.5,
	-1.4,
	-1,
	-0.5,
	-0.4,
	0,
	0.4,
	0.5,
	1,
	1.4,
	1.5,
	1.6
];

for (var i = 0, len = numbers.length; i < len; i++) {
	var num = numbers[i];
	with (Math) console.log(
		num,
		'toFixed', num.toFixed(),
		'ceil', ceil(num),
		'floor', floor(num),
		'round', round(num)
	);
}