为什么 javascript 算错了？

Question

Why javascript counted wrong?为什么 javascript 算错了？

console.log(3*9.7)    // =29.099999999999998?
console.log(3*97/10) // = 29.1

Answer 1

this is how Javascript's floating point arithmetic works.这就是 Javascript 的浮点运算的工作原理。 If you would like to know more how to avoid this I would recommend checking out this link.如果您想了解更多如何避免这种情况，我建议您查看此链接。 How to deal with floating point number precision in JavaScript? 如何处理 JavaScript 中的浮点数精度？