javascript 最多显示两位小数，不带尾随零
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Display numbers up to two decimals places without trailing zeros
提问by peroija
In my code I will be accepting multiple values, for example:
在我的代码中，我将接受多个值，例如：
8.7456
8.7
8
and I need to have them appear as
我需要让它们显示为
8.74
8.7
8
i.e. display up to two decimal place.
即显示最多两位小数。
I understand that .toFixed(2)will help me with the first value, but on the 2nd and 3rd value there will be trailing zeroes that I do not want.
我知道这.toFixed(2)将帮助我处理第一个值，但是在第二个和第三个值上会有我不想要的尾随零。
How to produce my desired results?
如何产生我想要的结果？
回答by Salman A
Use Number.toFixedto round the number up to two digits and format as a string. Then use String.replaceto chop off trailing zeros:
用于Number.toFixed将数字四舍五入为两位数并格式化为字符串。然后使用String.replace截断尾随零：
(8.7456).toFixed(2).replace(/\.?0+$/, ""); // "8.75"
(8.7).toFixed(2).replace(/\.?0+$/, ""); // "8.7"
(8).toFixed(2).replace(/\.?0+$/, ""); // "8"
回答by Ry-
Multiply by 100, floor, divide by 100.
乘以 100，floor除以 100。
var n = 8.7456;
var result = Math.floor(n * 100) / 100; // 8.74
Edit: if you're looking at this question after the fact, this is probably not what you want. It satisfies the odd requirement of having 8.7456appear as 8.74. See also the relevant comment.
编辑：如果您事后查看这个问题，这可能不是您想要的。它满足了8.7456出现为的奇怪要求8.74。另请参阅相关评论。
