Script in buttons?

I am looking to find out if I can place a script in a button so activation of it will triggers the script.
If it is possible, which and where do I place the various elements in the button?
I hope someone can help me!

The code for my button looks like this:
For Test
And the script I wish to trigger looks like this:
<script>
jQuery(document).ready(function($) {
$(‘.selected-package_3400’).click(function(){
var title = $(“.pack_title_3400”).attr(‘packtitle’);
var packid = “3400”;
var current_user_email = “XXX@XXXXXXXXXXXX.co.uk”;
var current_user_id = “11”;
var price = $(“.price_3400”).attr(‘packprice’);
var price1 = $(“.price_3400”).attr(‘packprice1’);
var time = $(“.pack_time_3400”).attr(‘packtime’);
var recurring = $(“.pack_recurring_3400”).attr(‘recurring’);
var listing = $(“.pack_listing_3400”).attr(‘listing’);
var featured_listing = $(“.pack_featured_listing_3400”).attr(‘featured_listing’);
var pack_date = $(“.pack_time_3400”).attr(‘pack_date’);
var pack_time = $(“.pack_time_3400”).attr(‘pack_time’);
var paypalMerchantEmail1 = “”;
var paypalUrlmode = “sandbox”;
var pack_currency = “£”;
var currency_placement = “before”;
var currency_code11 = “USD”;
var currency_sign1 = “£”;
if(price1 == 0){
var data = {
action: ‘packages_free_action’,
current_user_email: current_user_email,
current_user_id: current_user_id,
title: title,
time: time,
packid: packid,
price: price,
price1: price1,
listing: listing,
recurring: recurring,
featured_listing: featured_listing,
pack_date: pack_date,
pack_time: pack_time,
paypalMerchantEmail1: paypalMerchantEmail1,
paypalUrlmode: paypalUrlmode,
pack_currency: pack_currency,
currency_placement: currency_placement
};
$(‘#loadingmessage’).show();
$.ajax({
type: ‘POST’,
url: “https://XXXXXXXX.com/wp-admin/admin-ajax.php&#8221;,
data: data,
success: function(response) {
if(response !=””){
$(“.response”).html(”).html(response);
$(“.tablinks”).removeClass(‘active’);
$(“.tablinks:nth-child(3)”).addClass(‘active’)
$(“.tabcontent”).css(‘display’,’none’);
$(“#Done”).css(‘display’,’block’);
$(‘#loadingmessage’).hide();
}
else{
console.log(’empty’);
}
}
})
}
else{
var data = {
action: ‘packages_pass_action’,
current_user_email: current_user_email,
current_user_id: current_user_id,
title: title,
time: time,
packid: packid,
price: price,
price1: price1,
listing: listing,
recurring: recurring,
featured_listing: featured_listing,
pack_date: pack_date,
pack_time: pack_time,
paypalMerchantEmail1: paypalMerchantEmail1,
paypalUrlmode: paypalUrlmode,
pack_currency: pack_currency,
currency_placement: currency_placement,
currency_code11: currency_code11,
currency_sign1: currency_sign1

};
$(‘#loadingmessage’).show();
$.ajax({
type: ‘POST’,
url: “https://XXXXXXXXXXXX.com/wp-admin/admin-ajax.php&#8221;,
data: data,
success: function(response) {
if(response !=””){
$(“.payment-content”).html(”).html(response);
$(“.tablinks”).removeClass(‘active’);
$(“.tablinks:nth-child(2)”).addClass(‘active’)
$(“.tabcontent”).css(‘display’,’none’);
$(“#Payment”).css(‘display’,’block’);
$(‘#loadingmessage’).hide();
}
else{
console.log(’empty’);
}
}
})
}
});
});
</Script>