How does js judge whether it is a pure cyclic decimal, and if so, how to judge the cyclic segment?

If you write in decimal form, it must be circular, because it is impossible to enter an infinite number of decimal places, otherwise you will

1000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000.

If it can be written in the simplest fractional form, it is obviously a cycle.

If written in the simplest root form, the root number is greater than 1 and the root index is greater than 1, which is obviously not cyclic.

This judgment cannot be based on the calculation results, because the computing power of the computer is limited, not infinite. The output of the computer is decimal plus scientific counting method, which has a maximum output value and a minimum output value, so it can only be judged by the input results. Then the importer should know whether it is a cyclic decimal before entering it, so it is appropriate to establish a variable and remember whether this number is a cyclic decimal.

Even so, it doesn't help, it doesn't play any role, and it's impossible to determine whether all the calculation results will cycle according to this variable in the future calculation.

At least at present, computers can't compare with human brains. If the computer wins the human brain, human beings will be destroyed, and computers will rule the whole country, because at that time, computers can do everything, reproduce, produce and live, because human beings are also composed of substances and atomic molecules of the nucleus. Isn't it the same with computers? If anyone builds that computer, he will be guilty and he will destroy mankind.