If the value isn't a number (say it's number (xyz), for example), the function returns the string NaN (not a number).

如果值不是数字(譬如，假设它是number (xyz))，则函数返回字符串NaN(表示不是数字)。

youdao

When you preview the form to check the calculations, you see that the input fields for Subtotal and Total Price contain the letters NaN, which stand for Not a Number.

当预览表单以检查计算时，可以看到Subtotal和TotalPrice的输入字段包含字母NaN，这表示这个字段不是数字。

youdao

Many routines designed to read floats may allow values such as "NaN" (not a number).

许多设计用来读取浮点数的例程可能会允许“NaN”(非数字)这样的值。

youdao

Many routines designed to read floats may allow values such as "NaN" (not a number).

许多设计用来读取浮点数的例程可能会允许“NaN”(非数字)这样的值。

youdao