How can I get the precision of a decimal in js?

This is probably a super easy thing to solve, but I just can't think of an elegant solution right now.

Given the following numbers, how do I find the 开发者_JS百科precision (.0001) of each number.

126.01
1.3450

Update: The number of digits after the decimal.

The output from the top two numbers would be.

.01
.0001

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You can't. All Numbers have the standard JavaScript precision.

If you had "126.01" and "1.3450" (i.e. Strings), then you could do something like:

console.log("The precision of " + str_number + " is " + str_number.split('.')[1].length + " decimal places");

Or use 0 if you want significant figures instead.

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Maybe try building a simple function like:

function acc(num) {
  var splt = num.toString().replace(/\.|$/, '.').split('.');
  return splt[1].length
    ? 1 / Math.pow(10, splt[1].length)
    : Math.pow(10, /0*$/.exec(splt[0])[0].length);
}