我在Javascript中执行以下操作:
I'm performing the following operation in Javascript:
0.0030 / 0.031
0.0030 / 0.031
如何将结果舍入到任意数量的位置? var 的最大数量是多少?
How can I round the result to an arbitrary number of places? What's the maximum number that a var will hold?
推荐答案现代浏览器应该支持一个名为 toFixed()的方法。以下是网上举例:
Modern browsers should support a method called toFixed(). Here's an example taken from the web:
// Example: toFixed(2) when the number has no decimal places // It will add trailing zeros var num = 10; var result = num.toFixed(2); // result will equal 10.00 // Example: toFixed(3) when the number has decimal places // It will round to the thousandths place num = 930.9805; result = num.toFixed(3); // result will equal 930.981toPrecision()也可能对你有用,在那个页面上有另一个很好的例子。
toPrecision() might also be useful for you, there is another excellent example on that page.
对于旧版浏览器,你可以实现它手动使用 Math.round 。 Math.round()将舍入到最接近的整数。为了达到小数精度,你需要稍微操纵你的数字:
For older browsers, you can achieve it manually using Math.round. Math.round() will round to the nearest integer. In order to achieve decimal precision, you need to manipulate your numbers a bit:
- 申请Math.round()
- 除以10 ^ x
所以要将5.11111111舍入到三位小数,你可以这样做:
So to round 5.11111111 to three decimal places, you would do this:
var result=Math.round(5.111111*1000)/1000 //returns 5.111更多推荐
在Javascript中舍入除法的结果
发布评论