js prevent form form submission

<form id="login" class="form-horizontal" action="login_login.action" onsubmit="return validate();" method="post">

</form>

function validate(){
        alert("Please enter the verification code!"); //Then please enter the verification code  
        return false;
    }
    else if(inputCode != code ) {
        alert("The verification code is wrong! @_@") ; //The verification code input error will pop up  
        createCode();//Refresh the verification code  
        document.getElementById("verificatCode").value = "";//Clear the text box  
        return false;
    }
    else {//If the input is correct,
        return true ;
    }
}

The writing of onsubmit in the form must be "return method ()", but only "method ()" will not work. And if there is a return value, if it returns false, it will prevent the submission, and if it returns true, it will not. The wrong spelling is:

<form id="login" class="form-horizontal" action="login_login.action" onsubmit="validate();" method="post">

</form>