how to pass array in ajax code example

Example 1: passing data variable using ajax

var myVar = "test";

 $.ajax({
  url: "test.php",
  type: "POST",
  data:{"myData":myVar}
}).done(function(data) {
     console.log(data);
});

Example 2: how to send js array from ajax

$.ajax({
            type: "POST",
            url: "submit",
            data:JSON.stringify(detailsArr),
            success: function(html){
              alert( "Submitted");
                }
          });