源代码 :
点击运行
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <script> function showHint(str) { var xmlhttp; if (str.length==0) { document.getElementById("txtHint").innerHTML=""; return; } if (window.XMLHttpRequest) { // IE7+, Firefox, Chrome, Opera, Safari 浏览器执行代码 xmlhttp=new XMLHttpRequest(); } else { // IE6, IE5 浏览器执行代码 xmlhttp=new ActiveXObject("Microsoft.XMLHTTP"); } xmlhttp.onreadystatechange=function() { if (xmlhttp.readyState==4 && xmlhttp.status==200) { document.getElementById("txtHint").innerHTML=xmlhttp.responseText; } } xmlhttp.open("GET","/try/ajax/gethint.php?q="+str,true); xmlhttp.send(); } </script> </head> <body> <h3>在输入框中尝试输入字母 a:</h3> <form action=""> 输入姓名: <input type="text" id="txt1" onkeyup="showHint(this.value)" /> </form> <p>提示信息: <span id="txtHint"></span></p> </body> </html>
运行结果