<html><body><h1>XMLHttpRequest 对象</h1><p id="demo">让 AJAX 更改这段文本。</p><button type="button" onclick="loadDoc()">更改内容</button><script>function loadDoc() { var xhttp = new XMLHttpRequest(); xhttp.open("GET", "/demo/js/ajax_info.txt", false); xhttp.send(); document.getElementById("demo").innerHTML = xhttp.responseText;}</script></body></html>