Javascript – Format number to always show the original decimal places

I need a js function that show the original count of decimals in a number. For example:

value          display
2.31             2
1.0              1
2.3500           4

The problem is that i dont know how get the count of decimals.

I have that code:

value=2.3500;

return CountofDecimals(value); // must be display 4:

Anything help??? Thanks

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