[英]javascript make a numbers to be multiples of 150
I'm trying to get numbers to be multiples of 150. 我正在尝试使数字为150的倍数。
(all the num > 0)
if num = 0.333333 => output 150
if num = 149.9 => output 150
if num = 150 => output 150
if num = 150.1 => output 300
if num = 302 => output 450
...
Here is my code so far, using ceil()
: 到目前为止,这是我使用
ceil()
代码:
var num = '12';
document.write(Math.ceil((num/150)*150) + "<br />")
// Output 12, not 150;
How can I do this? 我怎样才能做到这一点?
You almost had it. 你差点就吃了。 Simply multiply after the rounding operation:
四舍五入后只需乘以:
function ceil150(x) {
return Math.ceil(x / 150) * 150;
}
alert(ceil150(0.333333));
alert(ceil150(149.9));
alert(ceil150(150));
alert(ceil150(150.1));
alert(ceil150(302));
This is simple algebra, sir: 先生,这是简单的代数:
(num / 150) * 150 = num
Substituting '12'
(yes, a string): 替换为
'12'
(是,字符串):
(num / 150) * 150 = 12
If you want all numbers to map to multiples of 150
, then just divide them by 150 and then floor
the result to get an integer: 如果您希望所有数字都映射为
150
倍数,则只需将它们除以150, 然后 floor
即可得到整数:
150 * math.floor(num / 150)
Or ceil
it: 或将其
ceil
:
150 * math.ceil(num / 150)
A simple way would be 一种简单的方法是
var num = 12;
var result = 150 * Math.ceil((num * 1.0)/150);
The multiplication by 1.0 ensures that input is converted to a floating point value - otherwise you may end up with integer division and get 12 / 150 = 0. 乘以1.0可确保将输入转换为浮点值-否则,您可能会得到整数除法并得到12/150 = 0。
var num = '12';
document.write(Math.ceil(num/150)*150) + "<br />")
Your parentheses were off by just a little. 您的括号只差了一点。
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