javascript - 减去 2 个小数 javascript

Question

嗨，我正在尝试减去 2 个十进制数，但它一直返回一些奇怪的数字。

var x = 0.00085022
var y = 0.00085050
var answer = x - y
alert(answer)

这是它返回的数字 -2.8000000000007186e-7

Answer 1

The maximum number of decimals is 17, but floating point arithmetic is not always 100% accurate http://www.w3schools.com/js/js_numbers.asp

试试这个:

var x = 0.00085022 * 100000000;
var y = 0.00085050 * 100000000;
var answer = (x - y) / 100000000;
alert(answer);