ทำไมใช้Script เช็คการกรอกข้อความในtext บนChrome แล้วไม่alert

<script>
function validateForm() {
     var c = document.forms["sss"]["fname"].value;
    if (c == ''){
         alert("โปรดกรอกชื่อของท่านค่ะ");
        return false;        
    }

    var d = document.forms["sss"]["lname"].value;
    if (d == ''){
         alert("Please enter your lastname");
        return false;        
    }

    var e = document.forms["sss"]["old"].value;
    if (e == '' ){
         alert("Please enter your age");
        return false;        
    }

    var x = document.forms["sss"]["email"].value;
    var atpos = x.indexOf("@");
    var dotpos = x.lastIndexOf(".");
    if (atpos<1 || dotpos<atpos+2 || dotpos+2>=x.length) {
        alert("Not a valid e-mail address");
        return false;

    }

    var a = document.forms["sss"]["phone"].value;
    if (a < 10){
         alert("Not a valid phone number");
        return false;        
    }

    var b = document.forms["sss"]["no"].value;
    if (b < 10){
         alert("Not a valid The 1 card number");
        return false;        
    }
   
    var f = document.forms["sss"]["money"].value;
    if (f == 'NOT CHOOSE'){
         alert("Please select your salary");
        return false;        
    }
    
   

}
</script>