JS Number.toFixed()方法调用对象的疑问

Question

在babel-node环境下试了toFixed()方法, 为什么2.toFixed(1)这个方法会报错? 而其他的写法不会报错.

Number(2).toFixed(1)
'2.0'
2.00.toFixed(1)
'2.0'
2.0.toFixed(1)
'2.0'
(2).toFixed(2)
'2.00'
2.toFixed(1)
SyntaxError: repl: Identifier directly after number (1:2)
1 | 2.toFixed(1)

Answer 1

A common misconception is that number literals cannot be used as objects. That is because a flaw in JavaScript's parser tries to parse the dot notation on a number as a floating point literal.