js random number function

jsRandomNo.js

function generateRandomString(length) {

for(var i = 0; i < length; i++){
    var letterToAppend = Math.ceil(Math.random() * 26); //will return a number between 1 - 26
    if(Math.floor(Math.random() * 10) % 2 == 0){
        letterToAppend += 96;
    } else {
        letterToAppend += 64;
    }
    randomString += (String.fromCharCode(letterToAppend));
}

return randomString;
}

console.log(generateRandomString(8));