How to check and set if/else condition that a value is only has two decimal points?

i'm writing a function and need to ensure that all of the inputs are correct before I do anything with them. one thing I need to do is check whether there are exactly 2 decimal points in a number. i can't figure out how to write this in an if/else condition.

for example:

2.22 = true
1.00 = true
10.32 = true
100.11 = true
12.1 = false
1.044 = false

I currently have the function checking that there is a decimal point, and that the value is a number like this:

 else if (data === "" || !data.includes('.') || isNaN(data) || !data=.split(".")[1].length > 3)) {...}

how would I go about doing this??

To accomplish this, use the JavaScript Split method. This method splits a string into an array based on the decimal point. Then you can check whether the second element (that is, the fractional part) of the split array has length 2. 

function checkTwoDecimalPoints(data) {
    var dataString = data.toString();
    if (dataString === "" || !dataString.includes('.') || isNaN(data)) {
        return false;
    }
    else {
        var decimalPart = dataString.split(".")[1];
        if (decimalPart.length === 2) {
            return true;
        }
        else {
            return false;
        }
    }
}