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<!DOCTYPE html> <html> <body> <h1>XMLHttpRequest 对象</h1> <h2>请在下面的输入字段中键入字母 A-Z：</h2> <p>搜索建议：<span id="txtHint"></span></p> <p>姓名：<input type="text" id="txt1" onkeyup="showHint(this.value)"></p> <script> function showHint(str) { var xhttp; if (str.length == 0) { document.getElementById("txtHint").innerHTML = ""; return; } xhttp = new XMLHttpRequest(); xhttp.onreadystatechange = function() { if (this.readyState == 4 && this.status == 200) { document.getElementById("txtHint").innerHTML = this.responseText; } }; xhttp.open("GET", "/demo/gethint.php?q="+str, true); xhttp.send(); } </script> </body> </html>