[рони]

FeelUs,

function password(str) {
    var Digit = /[0-9]/.test(str);
    var Upper = /[A-Z]/.test(str);
    var Lower = /[a-z]/.test(str);
    if (Digit && Upper && Lower && str.length > 7) return true;
    else return false
};

alert([password("123"),password("ZZZ"),password("1Za"),password("1Za1Za1Za")]);