如何将Javascript对象传递给PHP文件？

var obj = { name: "John", age: 25 };
$.ajax({
  url: "example.php",
  type: "POST",
  data: obj,
  success: function(response) {
    console.log(response);
  }
});

$name = $_POST['name'];
$age = $_POST['age'];
echo "Name: " . $name . ", Age: " . $age;

var obj = { name: "John", age: 25 };
var form = document.createElement("form");
form.method = "POST";
form.action = "example.php";

for (var key in obj) {
  if (obj.hasOwnProperty(key)) {
    var input = document.createElement("input");
    input.type = "hidden";
    input.name = key;
    input.value = obj[key];
    form.appendChild(input);
  }
}

document.body.appendChild(form);
form.submit();

$name = $_POST['name'];
$age = $_POST['age'];
echo "Name: " . $name . ", Age: " . $age;

var obj = { name: "John", age: 25 };
var jsonStr = JSON.stringify(obj);

$.ajax({
  url: "example.php",
  type: "POST",
  data: { data: jsonStr },
  success: function(response) {
    console.log(response);
  }
});

$jsonStr = $_POST['data'];
$obj = json_decode($jsonStr);
$name = $obj->name;
$age = $obj->age;
echo "Name: " . $name . ", Age: " . $age;