How can I return a random value from an array?

I'm using the jQuery validate plugin, and would like to return a random value on success.

Right now I'm trying to use:

     var success_message = new Array ();
     success_message[0] = "Good!";
     success_message[1] = "Ok!";
     success_message[2] = "Great!";
     success_message[3] = "Perfe开发者_运维百科ct!";
     success_message[4] = "Nice!";
     success_message[5] = "Awesome"; 
     var i = Math.floor(5 * Math.random())

Then where I need to output the value I use:

 $(document).ready(function(){
     var validator = $(".contactform").validate({
        success: function(label) {
           label.addClass("valid").text(success_message[i])
        }
     }); //end form validate code
 });

This selects a random value but uses the same value for each success message instead of selecting a different one for each field.

You can store the messages array and calculate the message to show as you go, like this:

var messages = ["Good!", "Great!", "Awesome!", "Super!", "Nice!"];
function getMessage() {
   return messages[Math.floor(Math.random() * messages.length)];
}

Give it a try here, then just call getMessage in your .text() call, like this:

label.addClass("valid").text(getMessage());

We can add Method to Array.

Array.prototype.getRandomVal = function(){
    return this[Math.floor(Math.random()*this.length)];
};

messages.getRandomVal();

function sucess() {
 message = ["Good!","Awesome!","Super!","Nice!","Great!"];
 return message[Math.floor(Math.random() * message.length)];
}

 $(document).ready(function(){
     var validator = $(".contactform").validate({ ...
              success: function(label) {
    label.addClass("valid").text(success());
 }
      }); //end form validate code
         });