css数据类型是一种特殊的类型，它表示一个整数，无论是正数还是负数。整数可以用于许多css属性，例如column-count,counter-increment,grid-column,grid-row,z-index

插值动画

设置动画时，数据类型的值将使用离散的完整步骤进行插值。计算过程就像是实数，浮点数一样；离散值是使用floor函数得到的。插值的速度由与动画相关联的定时函数确定。

语法

数据类型由一个或多个十进制数字组成，包括0到9，可以选择前面加一个+或-号。没有与整数关联的单位

实例

合法整型

12          Positive integer (without a leading + sign)
+123        Positive integer (with a leading + sign)
-456        Negative integer
0           Zero
+0          Zero, with a leading +
-0          Zero, with a leading -

非法整型:

12.0        This is a , not an , though it represents an integer.
12.         Decimal points are not allowed.
+---12      Only one leading +/- is allowed.
ten         Letters are not allowed.
_5          Special characters are not allowed.
\35         Escaped Unicode characters are not allowed, even if they are an integer (here: 5).
\4E94       Non-arabic numerals are not allowed, even when escaped (here: the Japanese 5, 五).
3e4         Scientific notation is not allowed.

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