一款不错的键盘密码输入js程序

//给输入的密码框添加新值
    function addValue(newValue)
    {
        if (CapsLockValue==0)
        {
            var str=Calc.password.value;
            if(str.length<password1.maxLength)
            {
                Calc.password.value += newValue;
            }            
            if(str.length<=password1.maxLength)
            {
                password1.value=Calc.password.value;
            }
        }
        else
        {
            var str=Calc.password.value;
            if(str.length<password1.maxLength)
            {
                Calc.password.value += newValue.toUpperCase();
            }
            if(str.length<=password1.maxLength)
            {
                password1.value=Calc.password.value;
            }
        }
    }
//实现BackSpace键的功能
    function setpassvalue()
    {
        var longnum=Calc.password.value.length;
        var num
        num=Calc.password.value.substr(0,longnum-1);
        Calc.password.value=num;
        var str=Calc.password.value;
            password1.value=Calc.password.value;