js 数字相减问题，出现很长的小数

Question

var two   = 0.2;
var one   = 0.1;
var eight = 0.8;
var six   = 0.6;

console.log(two - one);   // 0.1
console.log(eight - six); // 0.20000000000000007

这是为什么呢。。。

Answer 1

https://segmentfault.com/q/10...

Answer 2

JS 运算自身bug