Replacing alternate 2 digits of a number with dot in Polymer 3

问题

I want to replace alternate 2 digit of a number with a dot in polymer 3. I tried something but it is not working as i wanted. Please help.

before masking : 56789012 after masking : 5..8..1.

回答1:

Here you go have fun with it:

var maskingfield = function (str) {
    var out = "";
    for (var j = 0; j < str.length; j++) {
        if (j % 3 === 1 || j % 3 === 2) {
            out += '.';
        } else {
            out += str[j];
        }
    }
    return out;
} 

Calling : maskingfield("56789012") will give you "5..8..1."

来源：https://stackoverflow.com/questions/56747620/replacing-alternate-2-digits-of-a-number-with-dot-in-polymer-3