the secret LEMON code

I made my own secret code

by frogggeee McFrogggeee

HTML

<!DOCTYPE html>
<html>
<head>
<body>
<h1>the secret LEMON code</h1>
<h4>by frogggeee</h4>
<p>secret code decoder and encoder</p>
<button onclick="encode()">encode some words</button>
<button onclick="decode()">decode some code</button>
<p>L is for lehman</p>
<p>E is for eggs</p>
<p>M is for McMuffin</p>
<p>O is for old</p>
<p>N is for nonillion</p>
<h5>LEMON = lehmaneggsmcmuffinoldnonillion</h5>
<!--<h3>========</h3>
<h2>code:</h2>
<h4 id = "thecode"></h4>-->
<script>
var secretcode = 0;
function saycode() {
	document.getElementById("thecode").innerHTML = secretcode;
}
function encode() {
alert ("this is a secret code encoder");
var word = " ";
secretcode = 0;
var thing = 0;
word = prompt ("what do you want to encode? only lowercase letters, spaces and periods");
var g = word.length;
var i = 0;
var jjj = "h";
var rand = 1;
var rand2 = 0;
for (i = 0;i < g; i++) {
jjj = word.charAt(thing);
rand = Math.floor((Math.random()) * 3) + 1;
	if (jjj == "a") {
  	switch (rand) {
    case 1: secretcode = secretcode + "58"; break;
    case 2: secretcode = secretcode + "65"; break;
    case 3: secretcode = secretcode + "71"; break;
    }
  } else if (jjj == "b") {
  	switch (rand) {
    case 1: secretcode = secretcode + "42"; break;
    case 2: secretcode = secretcode + "21"; break;
    case 3: secretcode = secretcode + "83"; break;
    }
  } else if (jjj == "c") {
  	switch (rand) {
    case 1: secretcode = secretcode + "89"; break;
    case 2: secretcode = secretcode + "35"; break;
    case 3: secretcode = secretcode + "18"; break;
    }
  } else if (jjj == "d") {
  	switch (rand) {
    case 1: secretcode = secretcode + "56"; break;
    case 2: secretcode = secretcode + "91"; break;
    case 3: secretcode = secretcode + "30"; break;
    }
  } else if (jjj == "e") {
  	switch (rand) {
    case 1: secretcode = secretcode + "57"; break;
    case 2: secretcode = secretcode + "55"; break;
    case 3: secretcode = secretcode + "36"; break;
    }
  } else if (jjj == "f") {
 ...