JS those unexpected operations (1)--digits with mantissa can be transferred to a string

JS's flexibility has always been its highlight, as to whether it is the advantages or shortcomings?

This problem benevolent see, JS always have some unexpected usage, although these usages are not common, but enough to attract attention.

For example, the following is the case:

6. toString ()  //error6.. ToString ()   //"3"6...toString ()    //error

And this kind of operation?? Maybe you don't believe it, just try it yourself and ask why only the second one is legal, and the first and third will give an error. This is because when 6 is in the Mantissa (6.x), it can be converted to a string, but an empty string cannot be converted.

JS those unexpected operations (1)--digits with mantissa can be transferred to a string