英文:
why does CSS Calc() function requires whitespaces before and after "+"or "-" operators ONLY
问题
calc(10px + 2px); 正确
但是
calc(10px +2px); 会出错
或者
calc(10px - 2px); 正确
但是
calc(10px -2px); 会出错。然而，这不适用于其他运算符。
英文:
Ex:calc(10px + 2px); is correct
but
calc(10px +2px); gives out an error
or
calc(10px - 2px); is correct
but
calc(10px -2px); gives out an error. However, this doesn't apply to other operators
答案1
得分: 6
对于+运算符，操作可能会比calc(10px + 2px);更复杂一些。我的意思是像calc(5px + -1px);这样的东西实际上更复杂，而且不能是calc(5px+-1px);。
对于-运算符，CSS应该如何知道-是减号运算符还是负数的一部分？我是指从逻辑上来说。
此外，空格使代码更容易阅读，对于人类来说很重要。
在文档中了解更多关于CSS calc() 函数的信息。
英文:
For the + operator, the operation might get a little more complicated than calc(10px + 2px);. I mean something like calc(5px + -1px); is actually more complicated, and it can't be calc(5px+-1px);.
For the - operator, how CSS is supposed to know whether the - is the minus operator or a part of a negative number? I mean logically though.
Also, the whitespaces make the code nice to read, for humans.
Learn more about the CSS calc() function in the documentation.
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