AJAX请求，响应

作者：@kuaiquxie
作者的github：https://github.com/bitebita
本文为作者原创，如需转载，请注明出处：https://www.cnblogs.com/dzwj/p/15875620.html

用get发送信息

<!DOCTYPE html>
<html>
<body>

<h1>XMLHttpRequest 对象</h1>

<button type="button" onclick="loadDoc()">请求数据</button>

<p id="demo"></p>

<script>
function loadDoc() {
  var xhttp = new XMLHttpRequest();
  xhttp.onreadystatechange = function() {
    if (this.readyState == 4 && this.status == 200) {
      document.getElementById("demo").innerHTML = this.responseText;
    }
  };
  xhttp.open("GET", "/demo/demo_get2.asp?fname=Bill&lname=Gates", true);
  xhttp.send();
}
</script>
 
</body>
</html>

用post发送请求

<!DOCTYPE html>
<html>
<body>

<h1>XMLHttpRequest 对象</h1>

<button type="button" onclick="loadDoc()">请求数据</button>

<p id="demo"></p>
 
<script>
function loadDoc() {
  var xhttp = new XMLHttpRequest();
  xhttp.onreadystatechange = function() {
    if (this.readyState == 4 && this.status == 200) {
      document.getElementById("demo").innerHTML = this.responseText;
    }
  };
  xhttp.open("POST", "/demo/demo_post2.asp", true);
  xhttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
  xhttp.send("fname=Bill&lname=Gates");
}
</script>

</body>
</html>