javascript - 文字が許可されているか許可されていないか配列をチェックする

Question

notallowedcharacters の機能を機能チェックに追加したいのですが、どうすればよいですか?

var userinput = prompt('Input characters:');

var lowercase = userinput.toLowerCase();

var allowedcharacters = ["a", "b", "c", "d", "e", "f"]

var notallowedcharacters = ["g-z"] && ["!","@","#","€","£","$","%","&","?","*","/","\","|",";",":","<",">","[","]","{","-","_","^","~","`","±","§"]

function match(input, statement) {
    for (var i = 0; i < statement.length; i++) {
        if (input.indexOf(statement[i]) == -1) {
            return false;
        }
    }
    return true;
}

if (match(lowercase, allowedcharacters)){
  alert(true);
}
else{
  alert(false);
}