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<!DOCTYPE html> <html> <body> <h2>XMLHttpRequest 对象</h2> <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_post2.asp", true); xhttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded"); xhttp.send("fname=Henry&lname=Ford"); } </script> </body> </html>