javascript 逗号

I had a problem: I had a string that contained a decimal number, but the user could write it in two ways, using a dot, or a comma:

我有一个问题：我有一个包含十进制数字的字符串，但是用户可以用两种方式写它，使用点或逗号：

0,320.32

Different countries use different ways to separate the integral part from the decimal part of a number.

不同的国家/地区使用不同的方法将数字的整数部分与小数部分分开。

So I decided to convert the string to using a dot whenever I found a comma.

因此，我决定在发现逗号时将字符串转换为使用点。

I used a simple regular expression to do that:

我使用一个简单的正则表达式来做到这一点：

let value = '0,32'value = value.replace(/,/g, '.') //value is now '0.32'

You can do the opposite using replace(/\./g, ',') (note the \ before the . to escape it, since it’s a special character in )

你可以使用相反的replace(/\./g, ',')注意\之前.逃避它，因为它是在一个特殊字符 )

The g flag in the regex makes sure that if there are multiple instances of a comma (or dot, in the second example) they are all converted.

正则表达式中的g标志可确保如果有多个逗号实例(在第二个示例中为点，则为点)都将被转换。

This is not something that applies to our use case, and I think we need to do more validation to check the integrity of our input here, but it’s a start.

这不适用于我们的用例，我认为我们需要做更多的验证来检查我们输入的完整性，但这只是一个开始。

In my case, after doing this substitution I called parseFloat(value) to get the float from the string, and then I limited the decimals number to 2 using toFixed(2):

就我而言，执行此替换后，我调用parseFloat(value)从字符串中获取浮点数，然后使用toFixed(2)将小数位数限制为2：

value = parseFloat(value).toFixed(2)

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javascript 逗号