<form action="">
First name: <input type="text" name="FirstName" value="Bill" /><br />
Last name: <input type="text" name="LastName" value="Gates" /><br />
</form>
<script>
$(document).ready(function(){
 console.log($("form").serialize());
 // FirstName=Bill&LastName=Gates
});
</script>

$.ajax({
 type: 'post',
 url: 'your url',
 data: $("form").serialize(),
 success: function(data) {
  // your code
 }
});

$.post('your url', $("form").serialize(), function(data) {
  // your code
 }
});
$.get('your url', $("form").serialize(), function(data) {
  // your code
 }
});
$.getJSON('your url', $("form").serialize(), function(data) {
  // your code
 }
});