Introduction to Ajax get and post requests

The following article brings you an in-depth understanding of Ajax get and post requests. The content is quite good, so I will share it with you now and give it as a reference.

1.get request

function ()
 {
    //向服务器请求 时间
    //1.创建异步对象（小浏览器）
    var xhr = new XMLHttpRequest();
    //2.设置参数，true表示使用异步模式
    xhr.open("get", "GetTime.ashx?name= Mr靖", true); 
    //3.让get请求不从浏览器获取缓存数据
    xhr.setRequestHeader("If-Modified-Since","0");
    //3.设置回调函数
    xhr.onreadystatechange = function ()
    {
          //3.1当完全接收完响应报文后 并且 响应状态码为200的时候
          if (xhr.readyState == 4 && xhr.status == 200)
          {
            //3.2获取相应报文体内容
            var res = xhr.responseText;
            alert(res);
          }
    };
    //4.发送异步请求
    xhr.send(null);
}

2.post request

function ()
 {
    //向服务器请求 时间
    //1.创建异步对象（小浏览器）
    var xhr = new XMLHttpRequest();
    //2.设置参数
    xhr.open("post", "GetTime.ashx", true);
    //3.设置 请求 报文体 的 编码格式（设置为 表单默认编码格式）
    xhr.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
    //4.设置回调函数
    xhr.onreadystatechange = function ()
    {
        //3.1当完全接收完响应报文后 并且 响应状态码为200的时候
        if (xhr.readyState == 4 && xhr.status == 200)
       {
         //3.2获取相应报文体内容
          var res = xhr.responseText;
          alert(res);
       }
     };
     //5.发送异步请求"name=Mr靖"
     //5.1格式：直接拼接字符串 key=value&key1=value2
     xhr.send("name=Mr靖&age=18");
 };

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