js之原生ajax、Jquery-$.ajax、自定义ajax（post请求、get请求）

原生AJAX请求示例：

var xhr = new XMLHttpRequest();
xhr.open("POST", "your_url", true);
xhr.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
xhr.onreadystatechange = function () {
  if (xhr.readyState === 4 && xhr.status === 200) {
    console.log(xhr.responseText);
  }
};
xhr.send("param1=value1&param2=value2");

JQuery $.ajax 请求示例：

$.ajax({
  type: "POST",
  url: "your_url",
  data: { param1: "value1", param2: "value2" },
  success: function(response){
    console.log(response);
  },
  error: function(xhr, status, error){
    console.error("An error occurred: " + status + "\nError: " + error);
  }
});

自定义AJAX POST请求示例：

function postRequest(url, data, callback) {
  var xhr = new XMLHttpRequest();
  xhr.open("POST", url, true);
  xhr.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
  xhr.onreadystatechange = function () {
    if (xhr.readyState === 4 && xhr.status === 200) {
      callback(xhr.responseText);
    }
  };
  xhr.send(data);
}
 
postRequest("your_url", "param1=value1&param2=value2", function(response){
  console.log(response);
});

自定义AJAX GET请求示例：

function getRequest(url, callback) {
  var xhr = new XMLHttpRequest();
  xhr.open("GET", url, true);
  xhr.onreadystatechange = function () {
    if (xhr.readyState === 4 && xhr.status === 200) {
      callback(xhr.responseText);
    }
  };
  xhr.send();
}
 
getRequest("your_url", function(response){
  console.log(response);
});